19196d8acSJiri Slaby /* 29196d8acSJiri Slaby * Driver for 8250/16550-type serial ports 39196d8acSJiri Slaby * 49196d8acSJiri Slaby * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. 59196d8acSJiri Slaby * 69196d8acSJiri Slaby * Copyright (C) 2001 Russell King. 79196d8acSJiri Slaby * 89196d8acSJiri Slaby * This program is free software; you can redistribute it and/or modify 99196d8acSJiri Slaby * it under the terms of the GNU General Public License as published by 109196d8acSJiri Slaby * the Free Software Foundation; either version 2 of the License, or 119196d8acSJiri Slaby * (at your option) any later version. 129196d8acSJiri Slaby * 139196d8acSJiri Slaby * A note about mapbase / membase 149196d8acSJiri Slaby * 159196d8acSJiri Slaby * mapbase is the physical address of the IO port. 169196d8acSJiri Slaby * membase is an 'ioremapped' cookie. 179196d8acSJiri Slaby */ 189196d8acSJiri Slaby 199196d8acSJiri Slaby #if defined(CONFIG_SERIAL_8250_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) 209196d8acSJiri Slaby #define SUPPORT_SYSRQ 219196d8acSJiri Slaby #endif 229196d8acSJiri Slaby 239196d8acSJiri Slaby #include <linux/module.h> 249196d8acSJiri Slaby #include <linux/moduleparam.h> 259196d8acSJiri Slaby #include <linux/ioport.h> 269196d8acSJiri Slaby #include <linux/init.h> 279196d8acSJiri Slaby #include <linux/console.h> 289196d8acSJiri Slaby #include <linux/sysrq.h> 299196d8acSJiri Slaby #include <linux/delay.h> 309196d8acSJiri Slaby #include <linux/platform_device.h> 319196d8acSJiri Slaby #include <linux/tty.h> 329196d8acSJiri Slaby #include <linux/ratelimit.h> 339196d8acSJiri Slaby #include <linux/tty_flip.h> 349196d8acSJiri Slaby #include <linux/serial_core.h> 359196d8acSJiri Slaby #include <linux/serial.h> 369196d8acSJiri Slaby #include <linux/serial_8250.h> 379196d8acSJiri Slaby #include <linux/nmi.h> 389196d8acSJiri Slaby #include <linux/mutex.h> 399196d8acSJiri Slaby #include <linux/slab.h> 400b4af1d9SRicardo Ribalda Delgado #include <linux/uaccess.h> 41d74d5d1bSSebastian Andrzej Siewior #include <linux/pm_runtime.h> 429196d8acSJiri Slaby #ifdef CONFIG_SPARC 439196d8acSJiri Slaby #include <linux/sunserialcore.h> 449196d8acSJiri Slaby #endif 459196d8acSJiri Slaby 469196d8acSJiri Slaby #include <asm/io.h> 479196d8acSJiri Slaby #include <asm/irq.h> 489196d8acSJiri Slaby 499196d8acSJiri Slaby #include "8250.h" 509196d8acSJiri Slaby 519196d8acSJiri Slaby /* 529196d8acSJiri Slaby * Configuration: 539196d8acSJiri Slaby * share_irqs - whether we pass IRQF_SHARED to request_irq(). This option 549196d8acSJiri Slaby * is unsafe when used on edge-triggered interrupts. 559196d8acSJiri Slaby */ 569196d8acSJiri Slaby static unsigned int share_irqs = SERIAL8250_SHARE_IRQS; 579196d8acSJiri Slaby 589196d8acSJiri Slaby static unsigned int nr_uarts = CONFIG_SERIAL_8250_RUNTIME_UARTS; 599196d8acSJiri Slaby 609196d8acSJiri Slaby static struct uart_driver serial8250_reg; 619196d8acSJiri Slaby 629196d8acSJiri Slaby static int serial_index(struct uart_port *port) 639196d8acSJiri Slaby { 649196d8acSJiri Slaby return (serial8250_reg.minor - 64) + port->line; 659196d8acSJiri Slaby } 669196d8acSJiri Slaby 679196d8acSJiri Slaby static unsigned int skip_txen_test; /* force skip of txen test at init time */ 689196d8acSJiri Slaby 699196d8acSJiri Slaby /* 709196d8acSJiri Slaby * Debugging. 719196d8acSJiri Slaby */ 729196d8acSJiri Slaby #if 0 739196d8acSJiri Slaby #define DEBUG_AUTOCONF(fmt...) printk(fmt) 749196d8acSJiri Slaby #else 759196d8acSJiri Slaby #define DEBUG_AUTOCONF(fmt...) do { } while (0) 769196d8acSJiri Slaby #endif 779196d8acSJiri Slaby 789196d8acSJiri Slaby #if 0 799196d8acSJiri Slaby #define DEBUG_INTR(fmt...) printk(fmt) 809196d8acSJiri Slaby #else 819196d8acSJiri Slaby #define DEBUG_INTR(fmt...) do { } while (0) 829196d8acSJiri Slaby #endif 839196d8acSJiri Slaby 849196d8acSJiri Slaby #define PASS_LIMIT 512 859196d8acSJiri Slaby 869196d8acSJiri Slaby #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) 879196d8acSJiri Slaby 889196d8acSJiri Slaby 899196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_DETECT_IRQ 909196d8acSJiri Slaby #define CONFIG_SERIAL_DETECT_IRQ 1 919196d8acSJiri Slaby #endif 929196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_MANY_PORTS 939196d8acSJiri Slaby #define CONFIG_SERIAL_MANY_PORTS 1 949196d8acSJiri Slaby #endif 959196d8acSJiri Slaby 969196d8acSJiri Slaby /* 979196d8acSJiri Slaby * HUB6 is always on. This will be removed once the header 989196d8acSJiri Slaby * files have been cleaned. 999196d8acSJiri Slaby */ 1009196d8acSJiri Slaby #define CONFIG_HUB6 1 1019196d8acSJiri Slaby 1029196d8acSJiri Slaby #include <asm/serial.h> 1039196d8acSJiri Slaby /* 1049196d8acSJiri Slaby * SERIAL_PORT_DFNS tells us about built-in ports that have no 1059196d8acSJiri Slaby * standard enumeration mechanism. Platforms that can find all 1069196d8acSJiri Slaby * serial ports via mechanisms like ACPI or PCI need not supply it. 1079196d8acSJiri Slaby */ 1089196d8acSJiri Slaby #ifndef SERIAL_PORT_DFNS 1099196d8acSJiri Slaby #define SERIAL_PORT_DFNS 1109196d8acSJiri Slaby #endif 1119196d8acSJiri Slaby 1129196d8acSJiri Slaby static const struct old_serial_port old_serial_port[] = { 1139196d8acSJiri Slaby SERIAL_PORT_DFNS /* defined in asm/serial.h */ 1149196d8acSJiri Slaby }; 1159196d8acSJiri Slaby 1169196d8acSJiri Slaby #define UART_NR CONFIG_SERIAL_8250_NR_UARTS 1179196d8acSJiri Slaby 1189196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_RSA 1199196d8acSJiri Slaby 1209196d8acSJiri Slaby #define PORT_RSA_MAX 4 1219196d8acSJiri Slaby static unsigned long probe_rsa[PORT_RSA_MAX]; 1229196d8acSJiri Slaby static unsigned int probe_rsa_count; 1239196d8acSJiri Slaby #endif /* CONFIG_SERIAL_8250_RSA */ 1249196d8acSJiri Slaby 1259196d8acSJiri Slaby struct irq_info { 1269196d8acSJiri Slaby struct hlist_node node; 1279196d8acSJiri Slaby int irq; 1289196d8acSJiri Slaby spinlock_t lock; /* Protects list not the hash */ 1299196d8acSJiri Slaby struct list_head *head; 1309196d8acSJiri Slaby }; 1319196d8acSJiri Slaby 1329196d8acSJiri Slaby #define NR_IRQ_HASH 32 /* Can be adjusted later */ 1339196d8acSJiri Slaby static struct hlist_head irq_lists[NR_IRQ_HASH]; 1349196d8acSJiri Slaby static DEFINE_MUTEX(hash_mutex); /* Used to walk the hash */ 1359196d8acSJiri Slaby 1369196d8acSJiri Slaby /* 1379196d8acSJiri Slaby * Here we define the default xmit fifo size used for each type of UART. 1389196d8acSJiri Slaby */ 1399196d8acSJiri Slaby static const struct serial8250_config uart_config[] = { 1409196d8acSJiri Slaby [PORT_UNKNOWN] = { 1419196d8acSJiri Slaby .name = "unknown", 1429196d8acSJiri Slaby .fifo_size = 1, 1439196d8acSJiri Slaby .tx_loadsz = 1, 1449196d8acSJiri Slaby }, 1459196d8acSJiri Slaby [PORT_8250] = { 1469196d8acSJiri Slaby .name = "8250", 1479196d8acSJiri Slaby .fifo_size = 1, 1489196d8acSJiri Slaby .tx_loadsz = 1, 1499196d8acSJiri Slaby }, 1509196d8acSJiri Slaby [PORT_16450] = { 1519196d8acSJiri Slaby .name = "16450", 1529196d8acSJiri Slaby .fifo_size = 1, 1539196d8acSJiri Slaby .tx_loadsz = 1, 1549196d8acSJiri Slaby }, 1559196d8acSJiri Slaby [PORT_16550] = { 1569196d8acSJiri Slaby .name = "16550", 1579196d8acSJiri Slaby .fifo_size = 1, 1589196d8acSJiri Slaby .tx_loadsz = 1, 1599196d8acSJiri Slaby }, 1609196d8acSJiri Slaby [PORT_16550A] = { 1619196d8acSJiri Slaby .name = "16550A", 1629196d8acSJiri Slaby .fifo_size = 16, 1639196d8acSJiri Slaby .tx_loadsz = 16, 1649196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, 165aef9a7bdSYoshihiro YUNOMAE .rxtrig_bytes = {1, 4, 8, 14}, 1669196d8acSJiri Slaby .flags = UART_CAP_FIFO, 1679196d8acSJiri Slaby }, 1689196d8acSJiri Slaby [PORT_CIRRUS] = { 1699196d8acSJiri Slaby .name = "Cirrus", 1709196d8acSJiri Slaby .fifo_size = 1, 1719196d8acSJiri Slaby .tx_loadsz = 1, 1729196d8acSJiri Slaby }, 1739196d8acSJiri Slaby [PORT_16650] = { 1749196d8acSJiri Slaby .name = "ST16650", 1759196d8acSJiri Slaby .fifo_size = 1, 1769196d8acSJiri Slaby .tx_loadsz = 1, 1779196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP, 1789196d8acSJiri Slaby }, 1799196d8acSJiri Slaby [PORT_16650V2] = { 1809196d8acSJiri Slaby .name = "ST16650V2", 1819196d8acSJiri Slaby .fifo_size = 32, 1829196d8acSJiri Slaby .tx_loadsz = 16, 1839196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01 | 1849196d8acSJiri Slaby UART_FCR_T_TRIG_00, 185aef9a7bdSYoshihiro YUNOMAE .rxtrig_bytes = {8, 16, 24, 28}, 1869196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP, 1879196d8acSJiri Slaby }, 1889196d8acSJiri Slaby [PORT_16750] = { 1899196d8acSJiri Slaby .name = "TI16750", 1909196d8acSJiri Slaby .fifo_size = 64, 1919196d8acSJiri Slaby .tx_loadsz = 64, 1929196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10 | 1939196d8acSJiri Slaby UART_FCR7_64BYTE, 194aef9a7bdSYoshihiro YUNOMAE .rxtrig_bytes = {1, 16, 32, 56}, 1959196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_CAP_SLEEP | UART_CAP_AFE, 1969196d8acSJiri Slaby }, 1979196d8acSJiri Slaby [PORT_STARTECH] = { 1989196d8acSJiri Slaby .name = "Startech", 1999196d8acSJiri Slaby .fifo_size = 1, 2009196d8acSJiri Slaby .tx_loadsz = 1, 2019196d8acSJiri Slaby }, 2029196d8acSJiri Slaby [PORT_16C950] = { 2039196d8acSJiri Slaby .name = "16C950/954", 2049196d8acSJiri Slaby .fifo_size = 128, 2059196d8acSJiri Slaby .tx_loadsz = 128, 2069196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, 2079196d8acSJiri Slaby /* UART_CAP_EFR breaks billionon CF bluetooth card. */ 2089196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_CAP_SLEEP, 2099196d8acSJiri Slaby }, 2109196d8acSJiri Slaby [PORT_16654] = { 2119196d8acSJiri Slaby .name = "ST16654", 2129196d8acSJiri Slaby .fifo_size = 64, 2139196d8acSJiri Slaby .tx_loadsz = 32, 2149196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01 | 2159196d8acSJiri Slaby UART_FCR_T_TRIG_10, 216aef9a7bdSYoshihiro YUNOMAE .rxtrig_bytes = {8, 16, 56, 60}, 2179196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP, 2189196d8acSJiri Slaby }, 2199196d8acSJiri Slaby [PORT_16850] = { 2209196d8acSJiri Slaby .name = "XR16850", 2219196d8acSJiri Slaby .fifo_size = 128, 2229196d8acSJiri Slaby .tx_loadsz = 128, 2239196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, 2249196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP, 2259196d8acSJiri Slaby }, 2269196d8acSJiri Slaby [PORT_RSA] = { 2279196d8acSJiri Slaby .name = "RSA", 2289196d8acSJiri Slaby .fifo_size = 2048, 2299196d8acSJiri Slaby .tx_loadsz = 2048, 2309196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_11, 2319196d8acSJiri Slaby .flags = UART_CAP_FIFO, 2329196d8acSJiri Slaby }, 2339196d8acSJiri Slaby [PORT_NS16550A] = { 2349196d8acSJiri Slaby .name = "NS16550A", 2359196d8acSJiri Slaby .fifo_size = 16, 2369196d8acSJiri Slaby .tx_loadsz = 16, 2379196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, 2389196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_NATSEMI, 2399196d8acSJiri Slaby }, 2409196d8acSJiri Slaby [PORT_XSCALE] = { 2419196d8acSJiri Slaby .name = "XScale", 2429196d8acSJiri Slaby .fifo_size = 32, 2439196d8acSJiri Slaby .tx_loadsz = 32, 2449196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, 2459196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_CAP_UUE | UART_CAP_RTOIE, 2469196d8acSJiri Slaby }, 2479196d8acSJiri Slaby [PORT_OCTEON] = { 2489196d8acSJiri Slaby .name = "OCTEON", 2499196d8acSJiri Slaby .fifo_size = 64, 2509196d8acSJiri Slaby .tx_loadsz = 64, 2519196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, 2529196d8acSJiri Slaby .flags = UART_CAP_FIFO, 2539196d8acSJiri Slaby }, 2549196d8acSJiri Slaby [PORT_AR7] = { 2559196d8acSJiri Slaby .name = "AR7", 2569196d8acSJiri Slaby .fifo_size = 16, 2579196d8acSJiri Slaby .tx_loadsz = 16, 2589196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_00, 2599196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_CAP_AFE, 2609196d8acSJiri Slaby }, 2619196d8acSJiri Slaby [PORT_U6_16550A] = { 2629196d8acSJiri Slaby .name = "U6_16550A", 2639196d8acSJiri Slaby .fifo_size = 64, 2649196d8acSJiri Slaby .tx_loadsz = 64, 2659196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, 2669196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_CAP_AFE, 2679196d8acSJiri Slaby }, 2689196d8acSJiri Slaby [PORT_TEGRA] = { 2699196d8acSJiri Slaby .name = "Tegra", 2709196d8acSJiri Slaby .fifo_size = 32, 2719196d8acSJiri Slaby .tx_loadsz = 8, 2729196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01 | 2739196d8acSJiri Slaby UART_FCR_T_TRIG_01, 274aef9a7bdSYoshihiro YUNOMAE .rxtrig_bytes = {1, 4, 8, 14}, 2759196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_CAP_RTOIE, 2769196d8acSJiri Slaby }, 2779196d8acSJiri Slaby [PORT_XR17D15X] = { 2789196d8acSJiri Slaby .name = "XR17D15X", 2799196d8acSJiri Slaby .fifo_size = 64, 2809196d8acSJiri Slaby .tx_loadsz = 64, 2819196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, 2829196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_CAP_AFE | UART_CAP_EFR | 2839196d8acSJiri Slaby UART_CAP_SLEEP, 2849196d8acSJiri Slaby }, 2859196d8acSJiri Slaby [PORT_XR17V35X] = { 2869196d8acSJiri Slaby .name = "XR17V35X", 2879196d8acSJiri Slaby .fifo_size = 256, 2889196d8acSJiri Slaby .tx_loadsz = 256, 2899196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_11 | 2909196d8acSJiri Slaby UART_FCR_T_TRIG_11, 2919196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_CAP_AFE | UART_CAP_EFR | 2929196d8acSJiri Slaby UART_CAP_SLEEP, 2939196d8acSJiri Slaby }, 2949196d8acSJiri Slaby [PORT_LPC3220] = { 2959196d8acSJiri Slaby .name = "LPC3220", 2969196d8acSJiri Slaby .fifo_size = 64, 2979196d8acSJiri Slaby .tx_loadsz = 32, 2989196d8acSJiri Slaby .fcr = UART_FCR_DMA_SELECT | UART_FCR_ENABLE_FIFO | 2999196d8acSJiri Slaby UART_FCR_R_TRIG_00 | UART_FCR_T_TRIG_00, 3009196d8acSJiri Slaby .flags = UART_CAP_FIFO, 3019196d8acSJiri Slaby }, 3029196d8acSJiri Slaby [PORT_BRCM_TRUMANAGE] = { 3039196d8acSJiri Slaby .name = "TruManage", 3049196d8acSJiri Slaby .fifo_size = 1, 3059196d8acSJiri Slaby .tx_loadsz = 1024, 3069196d8acSJiri Slaby .flags = UART_CAP_HFIFO, 3079196d8acSJiri Slaby }, 3089196d8acSJiri Slaby [PORT_8250_CIR] = { 3099196d8acSJiri Slaby .name = "CIR port" 3109196d8acSJiri Slaby }, 3119196d8acSJiri Slaby [PORT_ALTR_16550_F32] = { 3129196d8acSJiri Slaby .name = "Altera 16550 FIFO32", 3139196d8acSJiri Slaby .fifo_size = 32, 3149196d8acSJiri Slaby .tx_loadsz = 32, 3159196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, 3169196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_CAP_AFE, 3179196d8acSJiri Slaby }, 3189196d8acSJiri Slaby [PORT_ALTR_16550_F64] = { 3199196d8acSJiri Slaby .name = "Altera 16550 FIFO64", 3209196d8acSJiri Slaby .fifo_size = 64, 3219196d8acSJiri Slaby .tx_loadsz = 64, 3229196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, 3239196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_CAP_AFE, 3249196d8acSJiri Slaby }, 3259196d8acSJiri Slaby [PORT_ALTR_16550_F128] = { 3269196d8acSJiri Slaby .name = "Altera 16550 FIFO128", 3279196d8acSJiri Slaby .fifo_size = 128, 3289196d8acSJiri Slaby .tx_loadsz = 128, 3299196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, 3309196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_CAP_AFE, 3319196d8acSJiri Slaby }, 3329196d8acSJiri Slaby }; 3339196d8acSJiri Slaby 3349196d8acSJiri Slaby /* Uart divisor latch read */ 3359196d8acSJiri Slaby static int default_serial_dl_read(struct uart_8250_port *up) 3369196d8acSJiri Slaby { 3379196d8acSJiri Slaby return serial_in(up, UART_DLL) | serial_in(up, UART_DLM) << 8; 3389196d8acSJiri Slaby } 3399196d8acSJiri Slaby 3409196d8acSJiri Slaby /* Uart divisor latch write */ 3419196d8acSJiri Slaby static void default_serial_dl_write(struct uart_8250_port *up, int value) 3429196d8acSJiri Slaby { 3439196d8acSJiri Slaby serial_out(up, UART_DLL, value & 0xff); 3449196d8acSJiri Slaby serial_out(up, UART_DLM, value >> 8 & 0xff); 3459196d8acSJiri Slaby } 3469196d8acSJiri Slaby 3479196d8acSJiri Slaby #if defined(CONFIG_MIPS_ALCHEMY) || defined(CONFIG_SERIAL_8250_RT288X) 3489196d8acSJiri Slaby 3499196d8acSJiri Slaby /* Au1x00/RT288x UART hardware has a weird register layout */ 3509196d8acSJiri Slaby static const u8 au_io_in_map[] = { 3519196d8acSJiri Slaby [UART_RX] = 0, 3529196d8acSJiri Slaby [UART_IER] = 2, 3539196d8acSJiri Slaby [UART_IIR] = 3, 3549196d8acSJiri Slaby [UART_LCR] = 5, 3559196d8acSJiri Slaby [UART_MCR] = 6, 3569196d8acSJiri Slaby [UART_LSR] = 7, 3579196d8acSJiri Slaby [UART_MSR] = 8, 3589196d8acSJiri Slaby }; 3599196d8acSJiri Slaby 3609196d8acSJiri Slaby static const u8 au_io_out_map[] = { 3619196d8acSJiri Slaby [UART_TX] = 1, 3629196d8acSJiri Slaby [UART_IER] = 2, 3639196d8acSJiri Slaby [UART_FCR] = 4, 3649196d8acSJiri Slaby [UART_LCR] = 5, 3659196d8acSJiri Slaby [UART_MCR] = 6, 3669196d8acSJiri Slaby }; 3679196d8acSJiri Slaby 3689196d8acSJiri Slaby static unsigned int au_serial_in(struct uart_port *p, int offset) 3699196d8acSJiri Slaby { 3709196d8acSJiri Slaby offset = au_io_in_map[offset] << p->regshift; 3719196d8acSJiri Slaby return __raw_readl(p->membase + offset); 3729196d8acSJiri Slaby } 3739196d8acSJiri Slaby 3749196d8acSJiri Slaby static void au_serial_out(struct uart_port *p, int offset, int value) 3759196d8acSJiri Slaby { 3769196d8acSJiri Slaby offset = au_io_out_map[offset] << p->regshift; 3779196d8acSJiri Slaby __raw_writel(value, p->membase + offset); 3789196d8acSJiri Slaby } 3799196d8acSJiri Slaby 3809196d8acSJiri Slaby /* Au1x00 haven't got a standard divisor latch */ 3819196d8acSJiri Slaby static int au_serial_dl_read(struct uart_8250_port *up) 3829196d8acSJiri Slaby { 3839196d8acSJiri Slaby return __raw_readl(up->port.membase + 0x28); 3849196d8acSJiri Slaby } 3859196d8acSJiri Slaby 3869196d8acSJiri Slaby static void au_serial_dl_write(struct uart_8250_port *up, int value) 3879196d8acSJiri Slaby { 3889196d8acSJiri Slaby __raw_writel(value, up->port.membase + 0x28); 3899196d8acSJiri Slaby } 3909196d8acSJiri Slaby 3919196d8acSJiri Slaby #endif 3929196d8acSJiri Slaby 3939196d8acSJiri Slaby static unsigned int hub6_serial_in(struct uart_port *p, int offset) 3949196d8acSJiri Slaby { 3959196d8acSJiri Slaby offset = offset << p->regshift; 3969196d8acSJiri Slaby outb(p->hub6 - 1 + offset, p->iobase); 3979196d8acSJiri Slaby return inb(p->iobase + 1); 3989196d8acSJiri Slaby } 3999196d8acSJiri Slaby 4009196d8acSJiri Slaby static void hub6_serial_out(struct uart_port *p, int offset, int value) 4019196d8acSJiri Slaby { 4029196d8acSJiri Slaby offset = offset << p->regshift; 4039196d8acSJiri Slaby outb(p->hub6 - 1 + offset, p->iobase); 4049196d8acSJiri Slaby outb(value, p->iobase + 1); 4059196d8acSJiri Slaby } 4069196d8acSJiri Slaby 4079196d8acSJiri Slaby static unsigned int mem_serial_in(struct uart_port *p, int offset) 4089196d8acSJiri Slaby { 4099196d8acSJiri Slaby offset = offset << p->regshift; 4109196d8acSJiri Slaby return readb(p->membase + offset); 4119196d8acSJiri Slaby } 4129196d8acSJiri Slaby 4139196d8acSJiri Slaby static void mem_serial_out(struct uart_port *p, int offset, int value) 4149196d8acSJiri Slaby { 4159196d8acSJiri Slaby offset = offset << p->regshift; 4169196d8acSJiri Slaby writeb(value, p->membase + offset); 4179196d8acSJiri Slaby } 4189196d8acSJiri Slaby 4199196d8acSJiri Slaby static void mem32_serial_out(struct uart_port *p, int offset, int value) 4209196d8acSJiri Slaby { 4219196d8acSJiri Slaby offset = offset << p->regshift; 4229196d8acSJiri Slaby writel(value, p->membase + offset); 4239196d8acSJiri Slaby } 4249196d8acSJiri Slaby 4259196d8acSJiri Slaby static unsigned int mem32_serial_in(struct uart_port *p, int offset) 4269196d8acSJiri Slaby { 4279196d8acSJiri Slaby offset = offset << p->regshift; 4289196d8acSJiri Slaby return readl(p->membase + offset); 4299196d8acSJiri Slaby } 4309196d8acSJiri Slaby 4319196d8acSJiri Slaby static unsigned int io_serial_in(struct uart_port *p, int offset) 4329196d8acSJiri Slaby { 4339196d8acSJiri Slaby offset = offset << p->regshift; 4349196d8acSJiri Slaby return inb(p->iobase + offset); 4359196d8acSJiri Slaby } 4369196d8acSJiri Slaby 4379196d8acSJiri Slaby static void io_serial_out(struct uart_port *p, int offset, int value) 4389196d8acSJiri Slaby { 4399196d8acSJiri Slaby offset = offset << p->regshift; 4409196d8acSJiri Slaby outb(value, p->iobase + offset); 4419196d8acSJiri Slaby } 4429196d8acSJiri Slaby 4439196d8acSJiri Slaby static int serial8250_default_handle_irq(struct uart_port *port); 4449196d8acSJiri Slaby static int exar_handle_irq(struct uart_port *port); 4459196d8acSJiri Slaby 4469196d8acSJiri Slaby static void set_io_from_upio(struct uart_port *p) 4479196d8acSJiri Slaby { 448b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(p); 4499196d8acSJiri Slaby 4509196d8acSJiri Slaby up->dl_read = default_serial_dl_read; 4519196d8acSJiri Slaby up->dl_write = default_serial_dl_write; 4529196d8acSJiri Slaby 4539196d8acSJiri Slaby switch (p->iotype) { 4549196d8acSJiri Slaby case UPIO_HUB6: 4559196d8acSJiri Slaby p->serial_in = hub6_serial_in; 4569196d8acSJiri Slaby p->serial_out = hub6_serial_out; 4579196d8acSJiri Slaby break; 4589196d8acSJiri Slaby 4599196d8acSJiri Slaby case UPIO_MEM: 4609196d8acSJiri Slaby p->serial_in = mem_serial_in; 4619196d8acSJiri Slaby p->serial_out = mem_serial_out; 4629196d8acSJiri Slaby break; 4639196d8acSJiri Slaby 4649196d8acSJiri Slaby case UPIO_MEM32: 4659196d8acSJiri Slaby p->serial_in = mem32_serial_in; 4669196d8acSJiri Slaby p->serial_out = mem32_serial_out; 4679196d8acSJiri Slaby break; 4689196d8acSJiri Slaby 4699196d8acSJiri Slaby #if defined(CONFIG_MIPS_ALCHEMY) || defined(CONFIG_SERIAL_8250_RT288X) 4709196d8acSJiri Slaby case UPIO_AU: 4719196d8acSJiri Slaby p->serial_in = au_serial_in; 4729196d8acSJiri Slaby p->serial_out = au_serial_out; 4739196d8acSJiri Slaby up->dl_read = au_serial_dl_read; 4749196d8acSJiri Slaby up->dl_write = au_serial_dl_write; 4759196d8acSJiri Slaby break; 4769196d8acSJiri Slaby #endif 4779196d8acSJiri Slaby 4789196d8acSJiri Slaby default: 4799196d8acSJiri Slaby p->serial_in = io_serial_in; 4809196d8acSJiri Slaby p->serial_out = io_serial_out; 4819196d8acSJiri Slaby break; 4829196d8acSJiri Slaby } 4839196d8acSJiri Slaby /* Remember loaded iotype */ 4849196d8acSJiri Slaby up->cur_iotype = p->iotype; 4859196d8acSJiri Slaby p->handle_irq = serial8250_default_handle_irq; 4869196d8acSJiri Slaby } 4879196d8acSJiri Slaby 4889196d8acSJiri Slaby static void 4899196d8acSJiri Slaby serial_port_out_sync(struct uart_port *p, int offset, int value) 4909196d8acSJiri Slaby { 4919196d8acSJiri Slaby switch (p->iotype) { 4929196d8acSJiri Slaby case UPIO_MEM: 4939196d8acSJiri Slaby case UPIO_MEM32: 4949196d8acSJiri Slaby case UPIO_AU: 4959196d8acSJiri Slaby p->serial_out(p, offset, value); 4969196d8acSJiri Slaby p->serial_in(p, UART_LCR); /* safe, no side-effects */ 4979196d8acSJiri Slaby break; 4989196d8acSJiri Slaby default: 4999196d8acSJiri Slaby p->serial_out(p, offset, value); 5009196d8acSJiri Slaby } 5019196d8acSJiri Slaby } 5029196d8acSJiri Slaby 5039196d8acSJiri Slaby /* 5049196d8acSJiri Slaby * For the 16C950 5059196d8acSJiri Slaby */ 5069196d8acSJiri Slaby static void serial_icr_write(struct uart_8250_port *up, int offset, int value) 5079196d8acSJiri Slaby { 5089196d8acSJiri Slaby serial_out(up, UART_SCR, offset); 5099196d8acSJiri Slaby serial_out(up, UART_ICR, value); 5109196d8acSJiri Slaby } 5119196d8acSJiri Slaby 5129196d8acSJiri Slaby static unsigned int serial_icr_read(struct uart_8250_port *up, int offset) 5139196d8acSJiri Slaby { 5149196d8acSJiri Slaby unsigned int value; 5159196d8acSJiri Slaby 5169196d8acSJiri Slaby serial_icr_write(up, UART_ACR, up->acr | UART_ACR_ICRRD); 5179196d8acSJiri Slaby serial_out(up, UART_SCR, offset); 5189196d8acSJiri Slaby value = serial_in(up, UART_ICR); 5199196d8acSJiri Slaby serial_icr_write(up, UART_ACR, up->acr); 5209196d8acSJiri Slaby 5219196d8acSJiri Slaby return value; 5229196d8acSJiri Slaby } 5239196d8acSJiri Slaby 5249196d8acSJiri Slaby /* 5259196d8acSJiri Slaby * FIFO support. 5269196d8acSJiri Slaby */ 5279196d8acSJiri Slaby static void serial8250_clear_fifos(struct uart_8250_port *p) 5289196d8acSJiri Slaby { 5299196d8acSJiri Slaby if (p->capabilities & UART_CAP_FIFO) { 5309196d8acSJiri Slaby serial_out(p, UART_FCR, UART_FCR_ENABLE_FIFO); 5319196d8acSJiri Slaby serial_out(p, UART_FCR, UART_FCR_ENABLE_FIFO | 5329196d8acSJiri Slaby UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); 5339196d8acSJiri Slaby serial_out(p, UART_FCR, 0); 5349196d8acSJiri Slaby } 5359196d8acSJiri Slaby } 5369196d8acSJiri Slaby 5379196d8acSJiri Slaby void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p) 5389196d8acSJiri Slaby { 5399196d8acSJiri Slaby serial8250_clear_fifos(p); 540aef9a7bdSYoshihiro YUNOMAE serial_out(p, UART_FCR, p->fcr); 5419196d8acSJiri Slaby } 5429196d8acSJiri Slaby EXPORT_SYMBOL_GPL(serial8250_clear_and_reinit_fifos); 5439196d8acSJiri Slaby 544d74d5d1bSSebastian Andrzej Siewior static void serial8250_rpm_get(struct uart_8250_port *p) 545d74d5d1bSSebastian Andrzej Siewior { 546d74d5d1bSSebastian Andrzej Siewior if (!(p->capabilities & UART_CAP_RPM)) 547d74d5d1bSSebastian Andrzej Siewior return; 548d74d5d1bSSebastian Andrzej Siewior pm_runtime_get_sync(p->port.dev); 549d74d5d1bSSebastian Andrzej Siewior } 550d74d5d1bSSebastian Andrzej Siewior 551d74d5d1bSSebastian Andrzej Siewior static void serial8250_rpm_put(struct uart_8250_port *p) 552d74d5d1bSSebastian Andrzej Siewior { 553d74d5d1bSSebastian Andrzej Siewior if (!(p->capabilities & UART_CAP_RPM)) 554d74d5d1bSSebastian Andrzej Siewior return; 555d74d5d1bSSebastian Andrzej Siewior pm_runtime_mark_last_busy(p->port.dev); 556d74d5d1bSSebastian Andrzej Siewior pm_runtime_put_autosuspend(p->port.dev); 557d74d5d1bSSebastian Andrzej Siewior } 558d74d5d1bSSebastian Andrzej Siewior 559d74d5d1bSSebastian Andrzej Siewior /* 560d74d5d1bSSebastian Andrzej Siewior * This two wrapper ensure, that enable_runtime_pm_tx() can be called more than 561d74d5d1bSSebastian Andrzej Siewior * once and disable_runtime_pm_tx() will still disable RPM because the fifo is 562d74d5d1bSSebastian Andrzej Siewior * empty and the HW can idle again. 563d74d5d1bSSebastian Andrzej Siewior */ 564d74d5d1bSSebastian Andrzej Siewior static void serial8250_rpm_get_tx(struct uart_8250_port *p) 565d74d5d1bSSebastian Andrzej Siewior { 566d74d5d1bSSebastian Andrzej Siewior unsigned char rpm_active; 567d74d5d1bSSebastian Andrzej Siewior 568d74d5d1bSSebastian Andrzej Siewior if (!(p->capabilities & UART_CAP_RPM)) 569d74d5d1bSSebastian Andrzej Siewior return; 570d74d5d1bSSebastian Andrzej Siewior 571d74d5d1bSSebastian Andrzej Siewior rpm_active = xchg(&p->rpm_tx_active, 1); 572d74d5d1bSSebastian Andrzej Siewior if (rpm_active) 573d74d5d1bSSebastian Andrzej Siewior return; 574d74d5d1bSSebastian Andrzej Siewior pm_runtime_get_sync(p->port.dev); 575d74d5d1bSSebastian Andrzej Siewior } 576d74d5d1bSSebastian Andrzej Siewior 577d74d5d1bSSebastian Andrzej Siewior static void serial8250_rpm_put_tx(struct uart_8250_port *p) 578d74d5d1bSSebastian Andrzej Siewior { 579d74d5d1bSSebastian Andrzej Siewior unsigned char rpm_active; 580d74d5d1bSSebastian Andrzej Siewior 581d74d5d1bSSebastian Andrzej Siewior if (!(p->capabilities & UART_CAP_RPM)) 582d74d5d1bSSebastian Andrzej Siewior return; 583d74d5d1bSSebastian Andrzej Siewior 584d74d5d1bSSebastian Andrzej Siewior rpm_active = xchg(&p->rpm_tx_active, 0); 585d74d5d1bSSebastian Andrzej Siewior if (!rpm_active) 586d74d5d1bSSebastian Andrzej Siewior return; 587d74d5d1bSSebastian Andrzej Siewior pm_runtime_mark_last_busy(p->port.dev); 588d74d5d1bSSebastian Andrzej Siewior pm_runtime_put_autosuspend(p->port.dev); 589d74d5d1bSSebastian Andrzej Siewior } 590d74d5d1bSSebastian Andrzej Siewior 5919196d8acSJiri Slaby /* 5929196d8acSJiri Slaby * IER sleep support. UARTs which have EFRs need the "extended 5939196d8acSJiri Slaby * capability" bit enabled. Note that on XR16C850s, we need to 5949196d8acSJiri Slaby * reset LCR to write to IER. 5959196d8acSJiri Slaby */ 5969196d8acSJiri Slaby static void serial8250_set_sleep(struct uart_8250_port *p, int sleep) 5979196d8acSJiri Slaby { 5989196d8acSJiri Slaby /* 5999196d8acSJiri Slaby * Exar UARTs have a SLEEP register that enables or disables 6009196d8acSJiri Slaby * each UART to enter sleep mode separately. On the XR17V35x the 6019196d8acSJiri Slaby * register is accessible to each UART at the UART_EXAR_SLEEP 6029196d8acSJiri Slaby * offset but the UART channel may only write to the corresponding 6039196d8acSJiri Slaby * bit. 6049196d8acSJiri Slaby */ 605d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_get(p); 6069196d8acSJiri Slaby if ((p->port.type == PORT_XR17V35X) || 6079196d8acSJiri Slaby (p->port.type == PORT_XR17D15X)) { 608b790f210SMichael Welling serial_out(p, UART_EXAR_SLEEP, sleep ? 0xff : 0); 609d74d5d1bSSebastian Andrzej Siewior goto out; 6109196d8acSJiri Slaby } 6119196d8acSJiri Slaby 6129196d8acSJiri Slaby if (p->capabilities & UART_CAP_SLEEP) { 6139196d8acSJiri Slaby if (p->capabilities & UART_CAP_EFR) { 6149196d8acSJiri Slaby serial_out(p, UART_LCR, UART_LCR_CONF_MODE_B); 6159196d8acSJiri Slaby serial_out(p, UART_EFR, UART_EFR_ECB); 6169196d8acSJiri Slaby serial_out(p, UART_LCR, 0); 6179196d8acSJiri Slaby } 6189196d8acSJiri Slaby serial_out(p, UART_IER, sleep ? UART_IERX_SLEEP : 0); 6199196d8acSJiri Slaby if (p->capabilities & UART_CAP_EFR) { 6209196d8acSJiri Slaby serial_out(p, UART_LCR, UART_LCR_CONF_MODE_B); 6219196d8acSJiri Slaby serial_out(p, UART_EFR, 0); 6229196d8acSJiri Slaby serial_out(p, UART_LCR, 0); 6239196d8acSJiri Slaby } 6249196d8acSJiri Slaby } 625d74d5d1bSSebastian Andrzej Siewior out: 626d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_put(p); 6279196d8acSJiri Slaby } 6289196d8acSJiri Slaby 6299196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_RSA 6309196d8acSJiri Slaby /* 6319196d8acSJiri Slaby * Attempts to turn on the RSA FIFO. Returns zero on failure. 6329196d8acSJiri Slaby * We set the port uart clock rate if we succeed. 6339196d8acSJiri Slaby */ 6349196d8acSJiri Slaby static int __enable_rsa(struct uart_8250_port *up) 6359196d8acSJiri Slaby { 6369196d8acSJiri Slaby unsigned char mode; 6379196d8acSJiri Slaby int result; 6389196d8acSJiri Slaby 6399196d8acSJiri Slaby mode = serial_in(up, UART_RSA_MSR); 6409196d8acSJiri Slaby result = mode & UART_RSA_MSR_FIFO; 6419196d8acSJiri Slaby 6429196d8acSJiri Slaby if (!result) { 6439196d8acSJiri Slaby serial_out(up, UART_RSA_MSR, mode | UART_RSA_MSR_FIFO); 6449196d8acSJiri Slaby mode = serial_in(up, UART_RSA_MSR); 6459196d8acSJiri Slaby result = mode & UART_RSA_MSR_FIFO; 6469196d8acSJiri Slaby } 6479196d8acSJiri Slaby 6489196d8acSJiri Slaby if (result) 6499196d8acSJiri Slaby up->port.uartclk = SERIAL_RSA_BAUD_BASE * 16; 6509196d8acSJiri Slaby 6519196d8acSJiri Slaby return result; 6529196d8acSJiri Slaby } 6539196d8acSJiri Slaby 6549196d8acSJiri Slaby static void enable_rsa(struct uart_8250_port *up) 6559196d8acSJiri Slaby { 6569196d8acSJiri Slaby if (up->port.type == PORT_RSA) { 6579196d8acSJiri Slaby if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16) { 6589196d8acSJiri Slaby spin_lock_irq(&up->port.lock); 6599196d8acSJiri Slaby __enable_rsa(up); 6609196d8acSJiri Slaby spin_unlock_irq(&up->port.lock); 6619196d8acSJiri Slaby } 6629196d8acSJiri Slaby if (up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) 6639196d8acSJiri Slaby serial_out(up, UART_RSA_FRR, 0); 6649196d8acSJiri Slaby } 6659196d8acSJiri Slaby } 6669196d8acSJiri Slaby 6679196d8acSJiri Slaby /* 6689196d8acSJiri Slaby * Attempts to turn off the RSA FIFO. Returns zero on failure. 6699196d8acSJiri Slaby * It is unknown why interrupts were disabled in here. However, 6709196d8acSJiri Slaby * the caller is expected to preserve this behaviour by grabbing 6719196d8acSJiri Slaby * the spinlock before calling this function. 6729196d8acSJiri Slaby */ 6739196d8acSJiri Slaby static void disable_rsa(struct uart_8250_port *up) 6749196d8acSJiri Slaby { 6759196d8acSJiri Slaby unsigned char mode; 6769196d8acSJiri Slaby int result; 6779196d8acSJiri Slaby 6789196d8acSJiri Slaby if (up->port.type == PORT_RSA && 6799196d8acSJiri Slaby up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) { 6809196d8acSJiri Slaby spin_lock_irq(&up->port.lock); 6819196d8acSJiri Slaby 6829196d8acSJiri Slaby mode = serial_in(up, UART_RSA_MSR); 6839196d8acSJiri Slaby result = !(mode & UART_RSA_MSR_FIFO); 6849196d8acSJiri Slaby 6859196d8acSJiri Slaby if (!result) { 6869196d8acSJiri Slaby serial_out(up, UART_RSA_MSR, mode & ~UART_RSA_MSR_FIFO); 6879196d8acSJiri Slaby mode = serial_in(up, UART_RSA_MSR); 6889196d8acSJiri Slaby result = !(mode & UART_RSA_MSR_FIFO); 6899196d8acSJiri Slaby } 6909196d8acSJiri Slaby 6919196d8acSJiri Slaby if (result) 6929196d8acSJiri Slaby up->port.uartclk = SERIAL_RSA_BAUD_BASE_LO * 16; 6939196d8acSJiri Slaby spin_unlock_irq(&up->port.lock); 6949196d8acSJiri Slaby } 6959196d8acSJiri Slaby } 6969196d8acSJiri Slaby #endif /* CONFIG_SERIAL_8250_RSA */ 6979196d8acSJiri Slaby 6989196d8acSJiri Slaby /* 6999196d8acSJiri Slaby * This is a quickie test to see how big the FIFO is. 7009196d8acSJiri Slaby * It doesn't work at all the time, more's the pity. 7019196d8acSJiri Slaby */ 7029196d8acSJiri Slaby static int size_fifo(struct uart_8250_port *up) 7039196d8acSJiri Slaby { 7049196d8acSJiri Slaby unsigned char old_fcr, old_mcr, old_lcr; 7059196d8acSJiri Slaby unsigned short old_dl; 7069196d8acSJiri Slaby int count; 7079196d8acSJiri Slaby 7089196d8acSJiri Slaby old_lcr = serial_in(up, UART_LCR); 7099196d8acSJiri Slaby serial_out(up, UART_LCR, 0); 7109196d8acSJiri Slaby old_fcr = serial_in(up, UART_FCR); 7119196d8acSJiri Slaby old_mcr = serial_in(up, UART_MCR); 7129196d8acSJiri Slaby serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | 7139196d8acSJiri Slaby UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); 7149196d8acSJiri Slaby serial_out(up, UART_MCR, UART_MCR_LOOP); 7159196d8acSJiri Slaby serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 7169196d8acSJiri Slaby old_dl = serial_dl_read(up); 7179196d8acSJiri Slaby serial_dl_write(up, 0x0001); 7189196d8acSJiri Slaby serial_out(up, UART_LCR, 0x03); 7199196d8acSJiri Slaby for (count = 0; count < 256; count++) 7209196d8acSJiri Slaby serial_out(up, UART_TX, count); 7219196d8acSJiri Slaby mdelay(20);/* FIXME - schedule_timeout */ 7229196d8acSJiri Slaby for (count = 0; (serial_in(up, UART_LSR) & UART_LSR_DR) && 7239196d8acSJiri Slaby (count < 256); count++) 7249196d8acSJiri Slaby serial_in(up, UART_RX); 7259196d8acSJiri Slaby serial_out(up, UART_FCR, old_fcr); 7269196d8acSJiri Slaby serial_out(up, UART_MCR, old_mcr); 7279196d8acSJiri Slaby serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 7289196d8acSJiri Slaby serial_dl_write(up, old_dl); 7299196d8acSJiri Slaby serial_out(up, UART_LCR, old_lcr); 7309196d8acSJiri Slaby 7319196d8acSJiri Slaby return count; 7329196d8acSJiri Slaby } 7339196d8acSJiri Slaby 7349196d8acSJiri Slaby /* 7359196d8acSJiri Slaby * Read UART ID using the divisor method - set DLL and DLM to zero 7369196d8acSJiri Slaby * and the revision will be in DLL and device type in DLM. We 7379196d8acSJiri Slaby * preserve the device state across this. 7389196d8acSJiri Slaby */ 7399196d8acSJiri Slaby static unsigned int autoconfig_read_divisor_id(struct uart_8250_port *p) 7409196d8acSJiri Slaby { 7419196d8acSJiri Slaby unsigned char old_dll, old_dlm, old_lcr; 7429196d8acSJiri Slaby unsigned int id; 7439196d8acSJiri Slaby 7449196d8acSJiri Slaby old_lcr = serial_in(p, UART_LCR); 7459196d8acSJiri Slaby serial_out(p, UART_LCR, UART_LCR_CONF_MODE_A); 7469196d8acSJiri Slaby 7479196d8acSJiri Slaby old_dll = serial_in(p, UART_DLL); 7489196d8acSJiri Slaby old_dlm = serial_in(p, UART_DLM); 7499196d8acSJiri Slaby 7509196d8acSJiri Slaby serial_out(p, UART_DLL, 0); 7519196d8acSJiri Slaby serial_out(p, UART_DLM, 0); 7529196d8acSJiri Slaby 7539196d8acSJiri Slaby id = serial_in(p, UART_DLL) | serial_in(p, UART_DLM) << 8; 7549196d8acSJiri Slaby 7559196d8acSJiri Slaby serial_out(p, UART_DLL, old_dll); 7569196d8acSJiri Slaby serial_out(p, UART_DLM, old_dlm); 7579196d8acSJiri Slaby serial_out(p, UART_LCR, old_lcr); 7589196d8acSJiri Slaby 7599196d8acSJiri Slaby return id; 7609196d8acSJiri Slaby } 7619196d8acSJiri Slaby 7629196d8acSJiri Slaby /* 7639196d8acSJiri Slaby * This is a helper routine to autodetect StarTech/Exar/Oxsemi UART's. 7649196d8acSJiri Slaby * When this function is called we know it is at least a StarTech 7659196d8acSJiri Slaby * 16650 V2, but it might be one of several StarTech UARTs, or one of 7669196d8acSJiri Slaby * its clones. (We treat the broken original StarTech 16650 V1 as a 7679196d8acSJiri Slaby * 16550, and why not? Startech doesn't seem to even acknowledge its 7689196d8acSJiri Slaby * existence.) 7699196d8acSJiri Slaby * 7709196d8acSJiri Slaby * What evil have men's minds wrought... 7719196d8acSJiri Slaby */ 7729196d8acSJiri Slaby static void autoconfig_has_efr(struct uart_8250_port *up) 7739196d8acSJiri Slaby { 7749196d8acSJiri Slaby unsigned int id1, id2, id3, rev; 7759196d8acSJiri Slaby 7769196d8acSJiri Slaby /* 7779196d8acSJiri Slaby * Everything with an EFR has SLEEP 7789196d8acSJiri Slaby */ 7799196d8acSJiri Slaby up->capabilities |= UART_CAP_EFR | UART_CAP_SLEEP; 7809196d8acSJiri Slaby 7819196d8acSJiri Slaby /* 7829196d8acSJiri Slaby * First we check to see if it's an Oxford Semiconductor UART. 7839196d8acSJiri Slaby * 7849196d8acSJiri Slaby * If we have to do this here because some non-National 7859196d8acSJiri Slaby * Semiconductor clone chips lock up if you try writing to the 7869196d8acSJiri Slaby * LSR register (which serial_icr_read does) 7879196d8acSJiri Slaby */ 7889196d8acSJiri Slaby 7899196d8acSJiri Slaby /* 7909196d8acSJiri Slaby * Check for Oxford Semiconductor 16C950. 7919196d8acSJiri Slaby * 7929196d8acSJiri Slaby * EFR [4] must be set else this test fails. 7939196d8acSJiri Slaby * 7949196d8acSJiri Slaby * This shouldn't be necessary, but Mike Hudson (Exoray@isys.ca) 7959196d8acSJiri Slaby * claims that it's needed for 952 dual UART's (which are not 7969196d8acSJiri Slaby * recommended for new designs). 7979196d8acSJiri Slaby */ 7989196d8acSJiri Slaby up->acr = 0; 7999196d8acSJiri Slaby serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 8009196d8acSJiri Slaby serial_out(up, UART_EFR, UART_EFR_ECB); 8019196d8acSJiri Slaby serial_out(up, UART_LCR, 0x00); 8029196d8acSJiri Slaby id1 = serial_icr_read(up, UART_ID1); 8039196d8acSJiri Slaby id2 = serial_icr_read(up, UART_ID2); 8049196d8acSJiri Slaby id3 = serial_icr_read(up, UART_ID3); 8059196d8acSJiri Slaby rev = serial_icr_read(up, UART_REV); 8069196d8acSJiri Slaby 8079196d8acSJiri Slaby DEBUG_AUTOCONF("950id=%02x:%02x:%02x:%02x ", id1, id2, id3, rev); 8089196d8acSJiri Slaby 8099196d8acSJiri Slaby if (id1 == 0x16 && id2 == 0xC9 && 8109196d8acSJiri Slaby (id3 == 0x50 || id3 == 0x52 || id3 == 0x54)) { 8119196d8acSJiri Slaby up->port.type = PORT_16C950; 8129196d8acSJiri Slaby 8139196d8acSJiri Slaby /* 8149196d8acSJiri Slaby * Enable work around for the Oxford Semiconductor 952 rev B 8159196d8acSJiri Slaby * chip which causes it to seriously miscalculate baud rates 8169196d8acSJiri Slaby * when DLL is 0. 8179196d8acSJiri Slaby */ 8189196d8acSJiri Slaby if (id3 == 0x52 && rev == 0x01) 8199196d8acSJiri Slaby up->bugs |= UART_BUG_QUOT; 8209196d8acSJiri Slaby return; 8219196d8acSJiri Slaby } 8229196d8acSJiri Slaby 8239196d8acSJiri Slaby /* 8249196d8acSJiri Slaby * We check for a XR16C850 by setting DLL and DLM to 0, and then 8259196d8acSJiri Slaby * reading back DLL and DLM. The chip type depends on the DLM 8269196d8acSJiri Slaby * value read back: 8279196d8acSJiri Slaby * 0x10 - XR16C850 and the DLL contains the chip revision. 8289196d8acSJiri Slaby * 0x12 - XR16C2850. 8299196d8acSJiri Slaby * 0x14 - XR16C854. 8309196d8acSJiri Slaby */ 8319196d8acSJiri Slaby id1 = autoconfig_read_divisor_id(up); 8329196d8acSJiri Slaby DEBUG_AUTOCONF("850id=%04x ", id1); 8339196d8acSJiri Slaby 8349196d8acSJiri Slaby id2 = id1 >> 8; 8359196d8acSJiri Slaby if (id2 == 0x10 || id2 == 0x12 || id2 == 0x14) { 8369196d8acSJiri Slaby up->port.type = PORT_16850; 8379196d8acSJiri Slaby return; 8389196d8acSJiri Slaby } 8399196d8acSJiri Slaby 8409196d8acSJiri Slaby /* 8419196d8acSJiri Slaby * It wasn't an XR16C850. 8429196d8acSJiri Slaby * 8439196d8acSJiri Slaby * We distinguish between the '654 and the '650 by counting 8449196d8acSJiri Slaby * how many bytes are in the FIFO. I'm using this for now, 8459196d8acSJiri Slaby * since that's the technique that was sent to me in the 8469196d8acSJiri Slaby * serial driver update, but I'm not convinced this works. 8479196d8acSJiri Slaby * I've had problems doing this in the past. -TYT 8489196d8acSJiri Slaby */ 8499196d8acSJiri Slaby if (size_fifo(up) == 64) 8509196d8acSJiri Slaby up->port.type = PORT_16654; 8519196d8acSJiri Slaby else 8529196d8acSJiri Slaby up->port.type = PORT_16650V2; 8539196d8acSJiri Slaby } 8549196d8acSJiri Slaby 8559196d8acSJiri Slaby /* 8569196d8acSJiri Slaby * We detected a chip without a FIFO. Only two fall into 8579196d8acSJiri Slaby * this category - the original 8250 and the 16450. The 8589196d8acSJiri Slaby * 16450 has a scratch register (accessible with LCR=0) 8599196d8acSJiri Slaby */ 8609196d8acSJiri Slaby static void autoconfig_8250(struct uart_8250_port *up) 8619196d8acSJiri Slaby { 8629196d8acSJiri Slaby unsigned char scratch, status1, status2; 8639196d8acSJiri Slaby 8649196d8acSJiri Slaby up->port.type = PORT_8250; 8659196d8acSJiri Slaby 8669196d8acSJiri Slaby scratch = serial_in(up, UART_SCR); 8679196d8acSJiri Slaby serial_out(up, UART_SCR, 0xa5); 8689196d8acSJiri Slaby status1 = serial_in(up, UART_SCR); 8699196d8acSJiri Slaby serial_out(up, UART_SCR, 0x5a); 8709196d8acSJiri Slaby status2 = serial_in(up, UART_SCR); 8719196d8acSJiri Slaby serial_out(up, UART_SCR, scratch); 8729196d8acSJiri Slaby 8739196d8acSJiri Slaby if (status1 == 0xa5 && status2 == 0x5a) 8749196d8acSJiri Slaby up->port.type = PORT_16450; 8759196d8acSJiri Slaby } 8769196d8acSJiri Slaby 8779196d8acSJiri Slaby static int broken_efr(struct uart_8250_port *up) 8789196d8acSJiri Slaby { 8799196d8acSJiri Slaby /* 8809196d8acSJiri Slaby * Exar ST16C2550 "A2" devices incorrectly detect as 8819196d8acSJiri Slaby * having an EFR, and report an ID of 0x0201. See 8829196d8acSJiri Slaby * http://linux.derkeiler.com/Mailing-Lists/Kernel/2004-11/4812.html 8839196d8acSJiri Slaby */ 8849196d8acSJiri Slaby if (autoconfig_read_divisor_id(up) == 0x0201 && size_fifo(up) == 16) 8859196d8acSJiri Slaby return 1; 8869196d8acSJiri Slaby 8879196d8acSJiri Slaby return 0; 8889196d8acSJiri Slaby } 8899196d8acSJiri Slaby 8909196d8acSJiri Slaby static inline int ns16550a_goto_highspeed(struct uart_8250_port *up) 8919196d8acSJiri Slaby { 8929196d8acSJiri Slaby unsigned char status; 8939196d8acSJiri Slaby 8949196d8acSJiri Slaby status = serial_in(up, 0x04); /* EXCR2 */ 8959196d8acSJiri Slaby #define PRESL(x) ((x) & 0x30) 8969196d8acSJiri Slaby if (PRESL(status) == 0x10) { 8979196d8acSJiri Slaby /* already in high speed mode */ 8989196d8acSJiri Slaby return 0; 8999196d8acSJiri Slaby } else { 9009196d8acSJiri Slaby status &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */ 9019196d8acSJiri Slaby status |= 0x10; /* 1.625 divisor for baud_base --> 921600 */ 9029196d8acSJiri Slaby serial_out(up, 0x04, status); 9039196d8acSJiri Slaby } 9049196d8acSJiri Slaby return 1; 9059196d8acSJiri Slaby } 9069196d8acSJiri Slaby 9079196d8acSJiri Slaby /* 9089196d8acSJiri Slaby * We know that the chip has FIFOs. Does it have an EFR? The 9099196d8acSJiri Slaby * EFR is located in the same register position as the IIR and 9109196d8acSJiri Slaby * we know the top two bits of the IIR are currently set. The 9119196d8acSJiri Slaby * EFR should contain zero. Try to read the EFR. 9129196d8acSJiri Slaby */ 9139196d8acSJiri Slaby static void autoconfig_16550a(struct uart_8250_port *up) 9149196d8acSJiri Slaby { 9159196d8acSJiri Slaby unsigned char status1, status2; 9169196d8acSJiri Slaby unsigned int iersave; 9179196d8acSJiri Slaby 9189196d8acSJiri Slaby up->port.type = PORT_16550A; 9199196d8acSJiri Slaby up->capabilities |= UART_CAP_FIFO; 9209196d8acSJiri Slaby 9219196d8acSJiri Slaby /* 9229196d8acSJiri Slaby * XR17V35x UARTs have an extra divisor register, DLD 9239196d8acSJiri Slaby * that gets enabled with when DLAB is set which will 9249196d8acSJiri Slaby * cause the device to incorrectly match and assign 9259196d8acSJiri Slaby * port type to PORT_16650. The EFR for this UART is 9269196d8acSJiri Slaby * found at offset 0x09. Instead check the Deice ID (DVID) 9279196d8acSJiri Slaby * register for a 2, 4 or 8 port UART. 9289196d8acSJiri Slaby */ 9299196d8acSJiri Slaby if (up->port.flags & UPF_EXAR_EFR) { 9309196d8acSJiri Slaby status1 = serial_in(up, UART_EXAR_DVID); 9319196d8acSJiri Slaby if (status1 == 0x82 || status1 == 0x84 || status1 == 0x88) { 9329196d8acSJiri Slaby DEBUG_AUTOCONF("Exar XR17V35x "); 9339196d8acSJiri Slaby up->port.type = PORT_XR17V35X; 9349196d8acSJiri Slaby up->capabilities |= UART_CAP_AFE | UART_CAP_EFR | 9359196d8acSJiri Slaby UART_CAP_SLEEP; 9369196d8acSJiri Slaby 9379196d8acSJiri Slaby return; 9389196d8acSJiri Slaby } 9399196d8acSJiri Slaby 9409196d8acSJiri Slaby } 9419196d8acSJiri Slaby 9429196d8acSJiri Slaby /* 9439196d8acSJiri Slaby * Check for presence of the EFR when DLAB is set. 9449196d8acSJiri Slaby * Only ST16C650V1 UARTs pass this test. 9459196d8acSJiri Slaby */ 9469196d8acSJiri Slaby serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 9479196d8acSJiri Slaby if (serial_in(up, UART_EFR) == 0) { 9489196d8acSJiri Slaby serial_out(up, UART_EFR, 0xA8); 9499196d8acSJiri Slaby if (serial_in(up, UART_EFR) != 0) { 9509196d8acSJiri Slaby DEBUG_AUTOCONF("EFRv1 "); 9519196d8acSJiri Slaby up->port.type = PORT_16650; 9529196d8acSJiri Slaby up->capabilities |= UART_CAP_EFR | UART_CAP_SLEEP; 9539196d8acSJiri Slaby } else { 9549196d8acSJiri Slaby DEBUG_AUTOCONF("Motorola 8xxx DUART "); 9559196d8acSJiri Slaby } 9569196d8acSJiri Slaby serial_out(up, UART_EFR, 0); 9579196d8acSJiri Slaby return; 9589196d8acSJiri Slaby } 9599196d8acSJiri Slaby 9609196d8acSJiri Slaby /* 9619196d8acSJiri Slaby * Maybe it requires 0xbf to be written to the LCR. 9629196d8acSJiri Slaby * (other ST16C650V2 UARTs, TI16C752A, etc) 9639196d8acSJiri Slaby */ 9649196d8acSJiri Slaby serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 9659196d8acSJiri Slaby if (serial_in(up, UART_EFR) == 0 && !broken_efr(up)) { 9669196d8acSJiri Slaby DEBUG_AUTOCONF("EFRv2 "); 9679196d8acSJiri Slaby autoconfig_has_efr(up); 9689196d8acSJiri Slaby return; 9699196d8acSJiri Slaby } 9709196d8acSJiri Slaby 9719196d8acSJiri Slaby /* 9729196d8acSJiri Slaby * Check for a National Semiconductor SuperIO chip. 9739196d8acSJiri Slaby * Attempt to switch to bank 2, read the value of the LOOP bit 9749196d8acSJiri Slaby * from EXCR1. Switch back to bank 0, change it in MCR. Then 9759196d8acSJiri Slaby * switch back to bank 2, read it from EXCR1 again and check 9769196d8acSJiri Slaby * it's changed. If so, set baud_base in EXCR2 to 921600. -- dwmw2 9779196d8acSJiri Slaby */ 9789196d8acSJiri Slaby serial_out(up, UART_LCR, 0); 9799196d8acSJiri Slaby status1 = serial_in(up, UART_MCR); 9809196d8acSJiri Slaby serial_out(up, UART_LCR, 0xE0); 9819196d8acSJiri Slaby status2 = serial_in(up, 0x02); /* EXCR1 */ 9829196d8acSJiri Slaby 9839196d8acSJiri Slaby if (!((status2 ^ status1) & UART_MCR_LOOP)) { 9849196d8acSJiri Slaby serial_out(up, UART_LCR, 0); 9859196d8acSJiri Slaby serial_out(up, UART_MCR, status1 ^ UART_MCR_LOOP); 9869196d8acSJiri Slaby serial_out(up, UART_LCR, 0xE0); 9879196d8acSJiri Slaby status2 = serial_in(up, 0x02); /* EXCR1 */ 9889196d8acSJiri Slaby serial_out(up, UART_LCR, 0); 9899196d8acSJiri Slaby serial_out(up, UART_MCR, status1); 9909196d8acSJiri Slaby 9919196d8acSJiri Slaby if ((status2 ^ status1) & UART_MCR_LOOP) { 9929196d8acSJiri Slaby unsigned short quot; 9939196d8acSJiri Slaby 9949196d8acSJiri Slaby serial_out(up, UART_LCR, 0xE0); 9959196d8acSJiri Slaby 9969196d8acSJiri Slaby quot = serial_dl_read(up); 9979196d8acSJiri Slaby quot <<= 3; 9989196d8acSJiri Slaby 9999196d8acSJiri Slaby if (ns16550a_goto_highspeed(up)) 10009196d8acSJiri Slaby serial_dl_write(up, quot); 10019196d8acSJiri Slaby 10029196d8acSJiri Slaby serial_out(up, UART_LCR, 0); 10039196d8acSJiri Slaby 10049196d8acSJiri Slaby up->port.uartclk = 921600*16; 10059196d8acSJiri Slaby up->port.type = PORT_NS16550A; 10069196d8acSJiri Slaby up->capabilities |= UART_NATSEMI; 10079196d8acSJiri Slaby return; 10089196d8acSJiri Slaby } 10099196d8acSJiri Slaby } 10109196d8acSJiri Slaby 10119196d8acSJiri Slaby /* 10129196d8acSJiri Slaby * No EFR. Try to detect a TI16750, which only sets bit 5 of 10139196d8acSJiri Slaby * the IIR when 64 byte FIFO mode is enabled when DLAB is set. 10149196d8acSJiri Slaby * Try setting it with and without DLAB set. Cheap clones 10159196d8acSJiri Slaby * set bit 5 without DLAB set. 10169196d8acSJiri Slaby */ 10179196d8acSJiri Slaby serial_out(up, UART_LCR, 0); 10189196d8acSJiri Slaby serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE); 10199196d8acSJiri Slaby status1 = serial_in(up, UART_IIR) >> 5; 10209196d8acSJiri Slaby serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); 10219196d8acSJiri Slaby serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 10229196d8acSJiri Slaby serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE); 10239196d8acSJiri Slaby status2 = serial_in(up, UART_IIR) >> 5; 10249196d8acSJiri Slaby serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); 10259196d8acSJiri Slaby serial_out(up, UART_LCR, 0); 10269196d8acSJiri Slaby 10279196d8acSJiri Slaby DEBUG_AUTOCONF("iir1=%d iir2=%d ", status1, status2); 10289196d8acSJiri Slaby 10299196d8acSJiri Slaby if (status1 == 6 && status2 == 7) { 10309196d8acSJiri Slaby up->port.type = PORT_16750; 10319196d8acSJiri Slaby up->capabilities |= UART_CAP_AFE | UART_CAP_SLEEP; 10329196d8acSJiri Slaby return; 10339196d8acSJiri Slaby } 10349196d8acSJiri Slaby 10359196d8acSJiri Slaby /* 10369196d8acSJiri Slaby * Try writing and reading the UART_IER_UUE bit (b6). 10379196d8acSJiri Slaby * If it works, this is probably one of the Xscale platform's 10389196d8acSJiri Slaby * internal UARTs. 10399196d8acSJiri Slaby * We're going to explicitly set the UUE bit to 0 before 10409196d8acSJiri Slaby * trying to write and read a 1 just to make sure it's not 10419196d8acSJiri Slaby * already a 1 and maybe locked there before we even start start. 10429196d8acSJiri Slaby */ 10439196d8acSJiri Slaby iersave = serial_in(up, UART_IER); 10449196d8acSJiri Slaby serial_out(up, UART_IER, iersave & ~UART_IER_UUE); 10459196d8acSJiri Slaby if (!(serial_in(up, UART_IER) & UART_IER_UUE)) { 10469196d8acSJiri Slaby /* 10479196d8acSJiri Slaby * OK it's in a known zero state, try writing and reading 10489196d8acSJiri Slaby * without disturbing the current state of the other bits. 10499196d8acSJiri Slaby */ 10509196d8acSJiri Slaby serial_out(up, UART_IER, iersave | UART_IER_UUE); 10519196d8acSJiri Slaby if (serial_in(up, UART_IER) & UART_IER_UUE) { 10529196d8acSJiri Slaby /* 10539196d8acSJiri Slaby * It's an Xscale. 10549196d8acSJiri Slaby * We'll leave the UART_IER_UUE bit set to 1 (enabled). 10559196d8acSJiri Slaby */ 10569196d8acSJiri Slaby DEBUG_AUTOCONF("Xscale "); 10579196d8acSJiri Slaby up->port.type = PORT_XSCALE; 10589196d8acSJiri Slaby up->capabilities |= UART_CAP_UUE | UART_CAP_RTOIE; 10599196d8acSJiri Slaby return; 10609196d8acSJiri Slaby } 10619196d8acSJiri Slaby } else { 10629196d8acSJiri Slaby /* 10639196d8acSJiri Slaby * If we got here we couldn't force the IER_UUE bit to 0. 10649196d8acSJiri Slaby * Log it and continue. 10659196d8acSJiri Slaby */ 10669196d8acSJiri Slaby DEBUG_AUTOCONF("Couldn't force IER_UUE to 0 "); 10679196d8acSJiri Slaby } 10689196d8acSJiri Slaby serial_out(up, UART_IER, iersave); 10699196d8acSJiri Slaby 10709196d8acSJiri Slaby /* 10719196d8acSJiri Slaby * Exar uarts have EFR in a weird location 10729196d8acSJiri Slaby */ 10739196d8acSJiri Slaby if (up->port.flags & UPF_EXAR_EFR) { 10749196d8acSJiri Slaby DEBUG_AUTOCONF("Exar XR17D15x "); 10759196d8acSJiri Slaby up->port.type = PORT_XR17D15X; 10769196d8acSJiri Slaby up->capabilities |= UART_CAP_AFE | UART_CAP_EFR | 10779196d8acSJiri Slaby UART_CAP_SLEEP; 10789196d8acSJiri Slaby 10799196d8acSJiri Slaby return; 10809196d8acSJiri Slaby } 10819196d8acSJiri Slaby 10829196d8acSJiri Slaby /* 10839196d8acSJiri Slaby * We distinguish between 16550A and U6 16550A by counting 10849196d8acSJiri Slaby * how many bytes are in the FIFO. 10859196d8acSJiri Slaby */ 10869196d8acSJiri Slaby if (up->port.type == PORT_16550A && size_fifo(up) == 64) { 10879196d8acSJiri Slaby up->port.type = PORT_U6_16550A; 10889196d8acSJiri Slaby up->capabilities |= UART_CAP_AFE; 10899196d8acSJiri Slaby } 10909196d8acSJiri Slaby } 10919196d8acSJiri Slaby 10929196d8acSJiri Slaby /* 10939196d8acSJiri Slaby * This routine is called by rs_init() to initialize a specific serial 10949196d8acSJiri Slaby * port. It determines what type of UART chip this serial port is 10959196d8acSJiri Slaby * using: 8250, 16450, 16550, 16550A. The important question is 10969196d8acSJiri Slaby * whether or not this UART is a 16550A or not, since this will 10979196d8acSJiri Slaby * determine whether or not we can use its FIFO features or not. 10989196d8acSJiri Slaby */ 10999196d8acSJiri Slaby static void autoconfig(struct uart_8250_port *up, unsigned int probeflags) 11009196d8acSJiri Slaby { 11019196d8acSJiri Slaby unsigned char status1, scratch, scratch2, scratch3; 11029196d8acSJiri Slaby unsigned char save_lcr, save_mcr; 11039196d8acSJiri Slaby struct uart_port *port = &up->port; 11049196d8acSJiri Slaby unsigned long flags; 11059196d8acSJiri Slaby unsigned int old_capabilities; 11069196d8acSJiri Slaby 11079196d8acSJiri Slaby if (!port->iobase && !port->mapbase && !port->membase) 11089196d8acSJiri Slaby return; 11099196d8acSJiri Slaby 11109196d8acSJiri Slaby DEBUG_AUTOCONF("ttyS%d: autoconf (0x%04lx, 0x%p): ", 11119196d8acSJiri Slaby serial_index(port), port->iobase, port->membase); 11129196d8acSJiri Slaby 11139196d8acSJiri Slaby /* 11149196d8acSJiri Slaby * We really do need global IRQs disabled here - we're going to 11159196d8acSJiri Slaby * be frobbing the chips IRQ enable register to see if it exists. 11169196d8acSJiri Slaby */ 11179196d8acSJiri Slaby spin_lock_irqsave(&port->lock, flags); 11189196d8acSJiri Slaby 11199196d8acSJiri Slaby up->capabilities = 0; 11209196d8acSJiri Slaby up->bugs = 0; 11219196d8acSJiri Slaby 11229196d8acSJiri Slaby if (!(port->flags & UPF_BUGGY_UART)) { 11239196d8acSJiri Slaby /* 11249196d8acSJiri Slaby * Do a simple existence test first; if we fail this, 11259196d8acSJiri Slaby * there's no point trying anything else. 11269196d8acSJiri Slaby * 11279196d8acSJiri Slaby * 0x80 is used as a nonsense port to prevent against 11289196d8acSJiri Slaby * false positives due to ISA bus float. The 11299196d8acSJiri Slaby * assumption is that 0x80 is a non-existent port; 11309196d8acSJiri Slaby * which should be safe since include/asm/io.h also 11319196d8acSJiri Slaby * makes this assumption. 11329196d8acSJiri Slaby * 11339196d8acSJiri Slaby * Note: this is safe as long as MCR bit 4 is clear 11349196d8acSJiri Slaby * and the device is in "PC" mode. 11359196d8acSJiri Slaby */ 11369196d8acSJiri Slaby scratch = serial_in(up, UART_IER); 11379196d8acSJiri Slaby serial_out(up, UART_IER, 0); 11389196d8acSJiri Slaby #ifdef __i386__ 11399196d8acSJiri Slaby outb(0xff, 0x080); 11409196d8acSJiri Slaby #endif 11419196d8acSJiri Slaby /* 11429196d8acSJiri Slaby * Mask out IER[7:4] bits for test as some UARTs (e.g. TL 11439196d8acSJiri Slaby * 16C754B) allow only to modify them if an EFR bit is set. 11449196d8acSJiri Slaby */ 11459196d8acSJiri Slaby scratch2 = serial_in(up, UART_IER) & 0x0f; 11469196d8acSJiri Slaby serial_out(up, UART_IER, 0x0F); 11479196d8acSJiri Slaby #ifdef __i386__ 11489196d8acSJiri Slaby outb(0, 0x080); 11499196d8acSJiri Slaby #endif 11509196d8acSJiri Slaby scratch3 = serial_in(up, UART_IER) & 0x0f; 11519196d8acSJiri Slaby serial_out(up, UART_IER, scratch); 11529196d8acSJiri Slaby if (scratch2 != 0 || scratch3 != 0x0F) { 11539196d8acSJiri Slaby /* 11549196d8acSJiri Slaby * We failed; there's nothing here 11559196d8acSJiri Slaby */ 11569196d8acSJiri Slaby spin_unlock_irqrestore(&port->lock, flags); 11579196d8acSJiri Slaby DEBUG_AUTOCONF("IER test failed (%02x, %02x) ", 11589196d8acSJiri Slaby scratch2, scratch3); 11599196d8acSJiri Slaby goto out; 11609196d8acSJiri Slaby } 11619196d8acSJiri Slaby } 11629196d8acSJiri Slaby 11639196d8acSJiri Slaby save_mcr = serial_in(up, UART_MCR); 11649196d8acSJiri Slaby save_lcr = serial_in(up, UART_LCR); 11659196d8acSJiri Slaby 11669196d8acSJiri Slaby /* 11679196d8acSJiri Slaby * Check to see if a UART is really there. Certain broken 11689196d8acSJiri Slaby * internal modems based on the Rockwell chipset fail this 11699196d8acSJiri Slaby * test, because they apparently don't implement the loopback 11709196d8acSJiri Slaby * test mode. So this test is skipped on the COM 1 through 11719196d8acSJiri Slaby * COM 4 ports. This *should* be safe, since no board 11729196d8acSJiri Slaby * manufacturer would be stupid enough to design a board 11739196d8acSJiri Slaby * that conflicts with COM 1-4 --- we hope! 11749196d8acSJiri Slaby */ 11759196d8acSJiri Slaby if (!(port->flags & UPF_SKIP_TEST)) { 11769196d8acSJiri Slaby serial_out(up, UART_MCR, UART_MCR_LOOP | 0x0A); 11779196d8acSJiri Slaby status1 = serial_in(up, UART_MSR) & 0xF0; 11789196d8acSJiri Slaby serial_out(up, UART_MCR, save_mcr); 11799196d8acSJiri Slaby if (status1 != 0x90) { 11809196d8acSJiri Slaby spin_unlock_irqrestore(&port->lock, flags); 11819196d8acSJiri Slaby DEBUG_AUTOCONF("LOOP test failed (%02x) ", 11829196d8acSJiri Slaby status1); 11839196d8acSJiri Slaby goto out; 11849196d8acSJiri Slaby } 11859196d8acSJiri Slaby } 11869196d8acSJiri Slaby 11879196d8acSJiri Slaby /* 11889196d8acSJiri Slaby * We're pretty sure there's a port here. Lets find out what 11899196d8acSJiri Slaby * type of port it is. The IIR top two bits allows us to find 11909196d8acSJiri Slaby * out if it's 8250 or 16450, 16550, 16550A or later. This 11919196d8acSJiri Slaby * determines what we test for next. 11929196d8acSJiri Slaby * 11939196d8acSJiri Slaby * We also initialise the EFR (if any) to zero for later. The 11949196d8acSJiri Slaby * EFR occupies the same register location as the FCR and IIR. 11959196d8acSJiri Slaby */ 11969196d8acSJiri Slaby serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 11979196d8acSJiri Slaby serial_out(up, UART_EFR, 0); 11989196d8acSJiri Slaby serial_out(up, UART_LCR, 0); 11999196d8acSJiri Slaby 12009196d8acSJiri Slaby serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); 12019196d8acSJiri Slaby scratch = serial_in(up, UART_IIR) >> 6; 12029196d8acSJiri Slaby 12039196d8acSJiri Slaby switch (scratch) { 12049196d8acSJiri Slaby case 0: 12059196d8acSJiri Slaby autoconfig_8250(up); 12069196d8acSJiri Slaby break; 12079196d8acSJiri Slaby case 1: 12089196d8acSJiri Slaby port->type = PORT_UNKNOWN; 12099196d8acSJiri Slaby break; 12109196d8acSJiri Slaby case 2: 12119196d8acSJiri Slaby port->type = PORT_16550; 12129196d8acSJiri Slaby break; 12139196d8acSJiri Slaby case 3: 12149196d8acSJiri Slaby autoconfig_16550a(up); 12159196d8acSJiri Slaby break; 12169196d8acSJiri Slaby } 12179196d8acSJiri Slaby 12189196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_RSA 12199196d8acSJiri Slaby /* 12209196d8acSJiri Slaby * Only probe for RSA ports if we got the region. 12219196d8acSJiri Slaby */ 12229196d8acSJiri Slaby if (port->type == PORT_16550A && probeflags & PROBE_RSA) { 12239196d8acSJiri Slaby int i; 12249196d8acSJiri Slaby 12259196d8acSJiri Slaby for (i = 0 ; i < probe_rsa_count; ++i) { 12269196d8acSJiri Slaby if (probe_rsa[i] == port->iobase && __enable_rsa(up)) { 12279196d8acSJiri Slaby port->type = PORT_RSA; 12289196d8acSJiri Slaby break; 12299196d8acSJiri Slaby } 12309196d8acSJiri Slaby } 12319196d8acSJiri Slaby } 12329196d8acSJiri Slaby #endif 12339196d8acSJiri Slaby 12349196d8acSJiri Slaby serial_out(up, UART_LCR, save_lcr); 12359196d8acSJiri Slaby 12369196d8acSJiri Slaby port->fifosize = uart_config[up->port.type].fifo_size; 12379196d8acSJiri Slaby old_capabilities = up->capabilities; 12389196d8acSJiri Slaby up->capabilities = uart_config[port->type].flags; 12399196d8acSJiri Slaby up->tx_loadsz = uart_config[port->type].tx_loadsz; 12409196d8acSJiri Slaby 12419196d8acSJiri Slaby if (port->type == PORT_UNKNOWN) 12429196d8acSJiri Slaby goto out_lock; 12439196d8acSJiri Slaby 12449196d8acSJiri Slaby /* 12459196d8acSJiri Slaby * Reset the UART. 12469196d8acSJiri Slaby */ 12479196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_RSA 12489196d8acSJiri Slaby if (port->type == PORT_RSA) 12499196d8acSJiri Slaby serial_out(up, UART_RSA_FRR, 0); 12509196d8acSJiri Slaby #endif 12519196d8acSJiri Slaby serial_out(up, UART_MCR, save_mcr); 12529196d8acSJiri Slaby serial8250_clear_fifos(up); 12539196d8acSJiri Slaby serial_in(up, UART_RX); 12549196d8acSJiri Slaby if (up->capabilities & UART_CAP_UUE) 12559196d8acSJiri Slaby serial_out(up, UART_IER, UART_IER_UUE); 12569196d8acSJiri Slaby else 12579196d8acSJiri Slaby serial_out(up, UART_IER, 0); 12589196d8acSJiri Slaby 12599196d8acSJiri Slaby out_lock: 12609196d8acSJiri Slaby spin_unlock_irqrestore(&port->lock, flags); 12619196d8acSJiri Slaby if (up->capabilities != old_capabilities) { 12629196d8acSJiri Slaby printk(KERN_WARNING 12639196d8acSJiri Slaby "ttyS%d: detected caps %08x should be %08x\n", 12649196d8acSJiri Slaby serial_index(port), old_capabilities, 12659196d8acSJiri Slaby up->capabilities); 12669196d8acSJiri Slaby } 12679196d8acSJiri Slaby out: 12689196d8acSJiri Slaby DEBUG_AUTOCONF("iir=%d ", scratch); 12699196d8acSJiri Slaby DEBUG_AUTOCONF("type=%s\n", uart_config[port->type].name); 12709196d8acSJiri Slaby } 12719196d8acSJiri Slaby 12729196d8acSJiri Slaby static void autoconfig_irq(struct uart_8250_port *up) 12739196d8acSJiri Slaby { 12749196d8acSJiri Slaby struct uart_port *port = &up->port; 12759196d8acSJiri Slaby unsigned char save_mcr, save_ier; 12769196d8acSJiri Slaby unsigned char save_ICP = 0; 12779196d8acSJiri Slaby unsigned int ICP = 0; 12789196d8acSJiri Slaby unsigned long irqs; 12799196d8acSJiri Slaby int irq; 12809196d8acSJiri Slaby 12819196d8acSJiri Slaby if (port->flags & UPF_FOURPORT) { 12829196d8acSJiri Slaby ICP = (port->iobase & 0xfe0) | 0x1f; 12839196d8acSJiri Slaby save_ICP = inb_p(ICP); 12849196d8acSJiri Slaby outb_p(0x80, ICP); 12859196d8acSJiri Slaby inb_p(ICP); 12869196d8acSJiri Slaby } 12879196d8acSJiri Slaby 12889196d8acSJiri Slaby /* forget possible initially masked and pending IRQ */ 12899196d8acSJiri Slaby probe_irq_off(probe_irq_on()); 12909196d8acSJiri Slaby save_mcr = serial_in(up, UART_MCR); 12919196d8acSJiri Slaby save_ier = serial_in(up, UART_IER); 12929196d8acSJiri Slaby serial_out(up, UART_MCR, UART_MCR_OUT1 | UART_MCR_OUT2); 12939196d8acSJiri Slaby 12949196d8acSJiri Slaby irqs = probe_irq_on(); 12959196d8acSJiri Slaby serial_out(up, UART_MCR, 0); 12969196d8acSJiri Slaby udelay(10); 12979196d8acSJiri Slaby if (port->flags & UPF_FOURPORT) { 12989196d8acSJiri Slaby serial_out(up, UART_MCR, 12999196d8acSJiri Slaby UART_MCR_DTR | UART_MCR_RTS); 13009196d8acSJiri Slaby } else { 13019196d8acSJiri Slaby serial_out(up, UART_MCR, 13029196d8acSJiri Slaby UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2); 13039196d8acSJiri Slaby } 13049196d8acSJiri Slaby serial_out(up, UART_IER, 0x0f); /* enable all intrs */ 13059196d8acSJiri Slaby serial_in(up, UART_LSR); 13069196d8acSJiri Slaby serial_in(up, UART_RX); 13079196d8acSJiri Slaby serial_in(up, UART_IIR); 13089196d8acSJiri Slaby serial_in(up, UART_MSR); 13099196d8acSJiri Slaby serial_out(up, UART_TX, 0xFF); 13109196d8acSJiri Slaby udelay(20); 13119196d8acSJiri Slaby irq = probe_irq_off(irqs); 13129196d8acSJiri Slaby 13139196d8acSJiri Slaby serial_out(up, UART_MCR, save_mcr); 13149196d8acSJiri Slaby serial_out(up, UART_IER, save_ier); 13159196d8acSJiri Slaby 13169196d8acSJiri Slaby if (port->flags & UPF_FOURPORT) 13179196d8acSJiri Slaby outb_p(save_ICP, ICP); 13189196d8acSJiri Slaby 13199196d8acSJiri Slaby port->irq = (irq > 0) ? irq : 0; 13209196d8acSJiri Slaby } 13219196d8acSJiri Slaby 13229196d8acSJiri Slaby static inline void __stop_tx(struct uart_8250_port *p) 13239196d8acSJiri Slaby { 13249196d8acSJiri Slaby if (p->ier & UART_IER_THRI) { 13259196d8acSJiri Slaby p->ier &= ~UART_IER_THRI; 13269196d8acSJiri Slaby serial_out(p, UART_IER, p->ier); 1327d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_put_tx(p); 13289196d8acSJiri Slaby } 13299196d8acSJiri Slaby } 13309196d8acSJiri Slaby 13319196d8acSJiri Slaby static void serial8250_stop_tx(struct uart_port *port) 13329196d8acSJiri Slaby { 1333b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 13349196d8acSJiri Slaby 1335d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_get(up); 13369196d8acSJiri Slaby __stop_tx(up); 13379196d8acSJiri Slaby 13389196d8acSJiri Slaby /* 13399196d8acSJiri Slaby * We really want to stop the transmitter from sending. 13409196d8acSJiri Slaby */ 13419196d8acSJiri Slaby if (port->type == PORT_16C950) { 13429196d8acSJiri Slaby up->acr |= UART_ACR_TXDIS; 13439196d8acSJiri Slaby serial_icr_write(up, UART_ACR, up->acr); 13449196d8acSJiri Slaby } 1345d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_put(up); 13469196d8acSJiri Slaby } 13479196d8acSJiri Slaby 13489196d8acSJiri Slaby static void serial8250_start_tx(struct uart_port *port) 13499196d8acSJiri Slaby { 1350b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 13519196d8acSJiri Slaby 1352d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_get_tx(up); 13539196d8acSJiri Slaby if (up->dma && !serial8250_tx_dma(up)) { 13549196d8acSJiri Slaby return; 13559196d8acSJiri Slaby } else if (!(up->ier & UART_IER_THRI)) { 13569196d8acSJiri Slaby up->ier |= UART_IER_THRI; 13579196d8acSJiri Slaby serial_port_out(port, UART_IER, up->ier); 13589196d8acSJiri Slaby 13599196d8acSJiri Slaby if (up->bugs & UART_BUG_TXEN) { 13609196d8acSJiri Slaby unsigned char lsr; 13619196d8acSJiri Slaby lsr = serial_in(up, UART_LSR); 13629196d8acSJiri Slaby up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS; 13639196d8acSJiri Slaby if (lsr & UART_LSR_TEMT) 13649196d8acSJiri Slaby serial8250_tx_chars(up); 13659196d8acSJiri Slaby } 13669196d8acSJiri Slaby } 13679196d8acSJiri Slaby 13689196d8acSJiri Slaby /* 13699196d8acSJiri Slaby * Re-enable the transmitter if we disabled it. 13709196d8acSJiri Slaby */ 13719196d8acSJiri Slaby if (port->type == PORT_16C950 && up->acr & UART_ACR_TXDIS) { 13729196d8acSJiri Slaby up->acr &= ~UART_ACR_TXDIS; 13739196d8acSJiri Slaby serial_icr_write(up, UART_ACR, up->acr); 13749196d8acSJiri Slaby } 13759196d8acSJiri Slaby } 13769196d8acSJiri Slaby 1377234abab1SSebastian Andrzej Siewior static void serial8250_throttle(struct uart_port *port) 1378234abab1SSebastian Andrzej Siewior { 1379234abab1SSebastian Andrzej Siewior port->throttle(port); 1380234abab1SSebastian Andrzej Siewior } 1381234abab1SSebastian Andrzej Siewior 1382234abab1SSebastian Andrzej Siewior static void serial8250_unthrottle(struct uart_port *port) 1383234abab1SSebastian Andrzej Siewior { 1384234abab1SSebastian Andrzej Siewior port->unthrottle(port); 1385234abab1SSebastian Andrzej Siewior } 1386234abab1SSebastian Andrzej Siewior 13879196d8acSJiri Slaby static void serial8250_stop_rx(struct uart_port *port) 13889196d8acSJiri Slaby { 1389b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 13909196d8acSJiri Slaby 1391d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_get(up); 1392d74d5d1bSSebastian Andrzej Siewior 13939196d8acSJiri Slaby up->ier &= ~UART_IER_RLSI; 13949196d8acSJiri Slaby up->port.read_status_mask &= ~UART_LSR_DR; 13959196d8acSJiri Slaby serial_port_out(port, UART_IER, up->ier); 1396d74d5d1bSSebastian Andrzej Siewior 1397d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_put(up); 13989196d8acSJiri Slaby } 13999196d8acSJiri Slaby 14009196d8acSJiri Slaby static void serial8250_enable_ms(struct uart_port *port) 14019196d8acSJiri Slaby { 1402b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 14039196d8acSJiri Slaby 14049196d8acSJiri Slaby /* no MSR capabilities */ 14059196d8acSJiri Slaby if (up->bugs & UART_BUG_NOMSR) 14069196d8acSJiri Slaby return; 14079196d8acSJiri Slaby 14089196d8acSJiri Slaby up->ier |= UART_IER_MSI; 1409d74d5d1bSSebastian Andrzej Siewior 1410d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_get(up); 14119196d8acSJiri Slaby serial_port_out(port, UART_IER, up->ier); 1412d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_put(up); 14139196d8acSJiri Slaby } 14149196d8acSJiri Slaby 14159196d8acSJiri Slaby /* 14169196d8acSJiri Slaby * serial8250_rx_chars: processes according to the passed in LSR 14179196d8acSJiri Slaby * value, and returns the remaining LSR bits not handled 14189196d8acSJiri Slaby * by this Rx routine. 14199196d8acSJiri Slaby */ 14209196d8acSJiri Slaby unsigned char 14219196d8acSJiri Slaby serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr) 14229196d8acSJiri Slaby { 14239196d8acSJiri Slaby struct uart_port *port = &up->port; 14249196d8acSJiri Slaby unsigned char ch; 14259196d8acSJiri Slaby int max_count = 256; 14269196d8acSJiri Slaby char flag; 14279196d8acSJiri Slaby 14289196d8acSJiri Slaby do { 14299196d8acSJiri Slaby if (likely(lsr & UART_LSR_DR)) 14309196d8acSJiri Slaby ch = serial_in(up, UART_RX); 14319196d8acSJiri Slaby else 14329196d8acSJiri Slaby /* 14339196d8acSJiri Slaby * Intel 82571 has a Serial Over Lan device that will 14349196d8acSJiri Slaby * set UART_LSR_BI without setting UART_LSR_DR when 14359196d8acSJiri Slaby * it receives a break. To avoid reading from the 14369196d8acSJiri Slaby * receive buffer without UART_LSR_DR bit set, we 14379196d8acSJiri Slaby * just force the read character to be 0 14389196d8acSJiri Slaby */ 14399196d8acSJiri Slaby ch = 0; 14409196d8acSJiri Slaby 14419196d8acSJiri Slaby flag = TTY_NORMAL; 14429196d8acSJiri Slaby port->icount.rx++; 14439196d8acSJiri Slaby 14449196d8acSJiri Slaby lsr |= up->lsr_saved_flags; 14459196d8acSJiri Slaby up->lsr_saved_flags = 0; 14469196d8acSJiri Slaby 14479196d8acSJiri Slaby if (unlikely(lsr & UART_LSR_BRK_ERROR_BITS)) { 14489196d8acSJiri Slaby if (lsr & UART_LSR_BI) { 14499196d8acSJiri Slaby lsr &= ~(UART_LSR_FE | UART_LSR_PE); 14509196d8acSJiri Slaby port->icount.brk++; 14519196d8acSJiri Slaby /* 14529196d8acSJiri Slaby * We do the SysRQ and SAK checking 14539196d8acSJiri Slaby * here because otherwise the break 14549196d8acSJiri Slaby * may get masked by ignore_status_mask 14559196d8acSJiri Slaby * or read_status_mask. 14569196d8acSJiri Slaby */ 14579196d8acSJiri Slaby if (uart_handle_break(port)) 14589196d8acSJiri Slaby goto ignore_char; 14599196d8acSJiri Slaby } else if (lsr & UART_LSR_PE) 14609196d8acSJiri Slaby port->icount.parity++; 14619196d8acSJiri Slaby else if (lsr & UART_LSR_FE) 14629196d8acSJiri Slaby port->icount.frame++; 14639196d8acSJiri Slaby if (lsr & UART_LSR_OE) 14649196d8acSJiri Slaby port->icount.overrun++; 14659196d8acSJiri Slaby 14669196d8acSJiri Slaby /* 14679196d8acSJiri Slaby * Mask off conditions which should be ignored. 14689196d8acSJiri Slaby */ 14699196d8acSJiri Slaby lsr &= port->read_status_mask; 14709196d8acSJiri Slaby 14719196d8acSJiri Slaby if (lsr & UART_LSR_BI) { 14729196d8acSJiri Slaby DEBUG_INTR("handling break...."); 14739196d8acSJiri Slaby flag = TTY_BREAK; 14749196d8acSJiri Slaby } else if (lsr & UART_LSR_PE) 14759196d8acSJiri Slaby flag = TTY_PARITY; 14769196d8acSJiri Slaby else if (lsr & UART_LSR_FE) 14779196d8acSJiri Slaby flag = TTY_FRAME; 14789196d8acSJiri Slaby } 14799196d8acSJiri Slaby if (uart_handle_sysrq_char(port, ch)) 14809196d8acSJiri Slaby goto ignore_char; 14819196d8acSJiri Slaby 14829196d8acSJiri Slaby uart_insert_char(port, lsr, UART_LSR_OE, ch, flag); 14839196d8acSJiri Slaby 14849196d8acSJiri Slaby ignore_char: 14859196d8acSJiri Slaby lsr = serial_in(up, UART_LSR); 14869196d8acSJiri Slaby } while ((lsr & (UART_LSR_DR | UART_LSR_BI)) && (max_count-- > 0)); 14879196d8acSJiri Slaby spin_unlock(&port->lock); 14889196d8acSJiri Slaby tty_flip_buffer_push(&port->state->port); 14899196d8acSJiri Slaby spin_lock(&port->lock); 14909196d8acSJiri Slaby return lsr; 14919196d8acSJiri Slaby } 14929196d8acSJiri Slaby EXPORT_SYMBOL_GPL(serial8250_rx_chars); 14939196d8acSJiri Slaby 14949196d8acSJiri Slaby void serial8250_tx_chars(struct uart_8250_port *up) 14959196d8acSJiri Slaby { 14969196d8acSJiri Slaby struct uart_port *port = &up->port; 14979196d8acSJiri Slaby struct circ_buf *xmit = &port->state->xmit; 14989196d8acSJiri Slaby int count; 14999196d8acSJiri Slaby 15009196d8acSJiri Slaby if (port->x_char) { 15019196d8acSJiri Slaby serial_out(up, UART_TX, port->x_char); 15029196d8acSJiri Slaby port->icount.tx++; 15039196d8acSJiri Slaby port->x_char = 0; 15049196d8acSJiri Slaby return; 15059196d8acSJiri Slaby } 15069196d8acSJiri Slaby if (uart_tx_stopped(port)) { 15079196d8acSJiri Slaby serial8250_stop_tx(port); 15089196d8acSJiri Slaby return; 15099196d8acSJiri Slaby } 15109196d8acSJiri Slaby if (uart_circ_empty(xmit)) { 15119196d8acSJiri Slaby __stop_tx(up); 15129196d8acSJiri Slaby return; 15139196d8acSJiri Slaby } 15149196d8acSJiri Slaby 15159196d8acSJiri Slaby count = up->tx_loadsz; 15169196d8acSJiri Slaby do { 15179196d8acSJiri Slaby serial_out(up, UART_TX, xmit->buf[xmit->tail]); 15189196d8acSJiri Slaby xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); 15199196d8acSJiri Slaby port->icount.tx++; 15209196d8acSJiri Slaby if (uart_circ_empty(xmit)) 15219196d8acSJiri Slaby break; 15229196d8acSJiri Slaby if (up->capabilities & UART_CAP_HFIFO) { 15239196d8acSJiri Slaby if ((serial_port_in(port, UART_LSR) & BOTH_EMPTY) != 15249196d8acSJiri Slaby BOTH_EMPTY) 15259196d8acSJiri Slaby break; 15269196d8acSJiri Slaby } 15279196d8acSJiri Slaby } while (--count > 0); 15289196d8acSJiri Slaby 15299196d8acSJiri Slaby if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 15309196d8acSJiri Slaby uart_write_wakeup(port); 15319196d8acSJiri Slaby 15329196d8acSJiri Slaby DEBUG_INTR("THRE..."); 15339196d8acSJiri Slaby 1534d74d5d1bSSebastian Andrzej Siewior /* 1535d74d5d1bSSebastian Andrzej Siewior * With RPM enabled, we have to wait once the FIFO is empty before the 1536d74d5d1bSSebastian Andrzej Siewior * HW can go idle. So we get here once again with empty FIFO and disable 1537d74d5d1bSSebastian Andrzej Siewior * the interrupt and RPM in __stop_tx() 1538d74d5d1bSSebastian Andrzej Siewior */ 1539d74d5d1bSSebastian Andrzej Siewior if (uart_circ_empty(xmit) && !(up->capabilities & UART_CAP_RPM)) 15409196d8acSJiri Slaby __stop_tx(up); 15419196d8acSJiri Slaby } 15429196d8acSJiri Slaby EXPORT_SYMBOL_GPL(serial8250_tx_chars); 15439196d8acSJiri Slaby 15445435d20fSPeter Hurley /* Caller holds uart port lock */ 15459196d8acSJiri Slaby unsigned int serial8250_modem_status(struct uart_8250_port *up) 15469196d8acSJiri Slaby { 15479196d8acSJiri Slaby struct uart_port *port = &up->port; 15489196d8acSJiri Slaby unsigned int status = serial_in(up, UART_MSR); 15499196d8acSJiri Slaby 15509196d8acSJiri Slaby status |= up->msr_saved_flags; 15519196d8acSJiri Slaby up->msr_saved_flags = 0; 15529196d8acSJiri Slaby if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI && 15539196d8acSJiri Slaby port->state != NULL) { 15549196d8acSJiri Slaby if (status & UART_MSR_TERI) 15559196d8acSJiri Slaby port->icount.rng++; 15569196d8acSJiri Slaby if (status & UART_MSR_DDSR) 15579196d8acSJiri Slaby port->icount.dsr++; 15589196d8acSJiri Slaby if (status & UART_MSR_DDCD) 15599196d8acSJiri Slaby uart_handle_dcd_change(port, status & UART_MSR_DCD); 15609196d8acSJiri Slaby if (status & UART_MSR_DCTS) 15619196d8acSJiri Slaby uart_handle_cts_change(port, status & UART_MSR_CTS); 15629196d8acSJiri Slaby 15639196d8acSJiri Slaby wake_up_interruptible(&port->state->port.delta_msr_wait); 15649196d8acSJiri Slaby } 15659196d8acSJiri Slaby 15669196d8acSJiri Slaby return status; 15679196d8acSJiri Slaby } 15689196d8acSJiri Slaby EXPORT_SYMBOL_GPL(serial8250_modem_status); 15699196d8acSJiri Slaby 15709196d8acSJiri Slaby /* 15719196d8acSJiri Slaby * This handles the interrupt from one port. 15729196d8acSJiri Slaby */ 15739196d8acSJiri Slaby int serial8250_handle_irq(struct uart_port *port, unsigned int iir) 15749196d8acSJiri Slaby { 15759196d8acSJiri Slaby unsigned char status; 15769196d8acSJiri Slaby unsigned long flags; 1577b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 15789196d8acSJiri Slaby int dma_err = 0; 15799196d8acSJiri Slaby 15809196d8acSJiri Slaby if (iir & UART_IIR_NO_INT) 15819196d8acSJiri Slaby return 0; 15829196d8acSJiri Slaby 15839196d8acSJiri Slaby spin_lock_irqsave(&port->lock, flags); 15849196d8acSJiri Slaby 15859196d8acSJiri Slaby status = serial_port_in(port, UART_LSR); 15869196d8acSJiri Slaby 15879196d8acSJiri Slaby DEBUG_INTR("status = %x...", status); 15889196d8acSJiri Slaby 15899196d8acSJiri Slaby if (status & (UART_LSR_DR | UART_LSR_BI)) { 15909196d8acSJiri Slaby if (up->dma) 15919196d8acSJiri Slaby dma_err = serial8250_rx_dma(up, iir); 15929196d8acSJiri Slaby 15939196d8acSJiri Slaby if (!up->dma || dma_err) 15949196d8acSJiri Slaby status = serial8250_rx_chars(up, status); 15959196d8acSJiri Slaby } 15969196d8acSJiri Slaby serial8250_modem_status(up); 1597b08c9c31SLoic Poulain if (!up->dma && (status & UART_LSR_THRE)) 15989196d8acSJiri Slaby serial8250_tx_chars(up); 15999196d8acSJiri Slaby 16009196d8acSJiri Slaby spin_unlock_irqrestore(&port->lock, flags); 16019196d8acSJiri Slaby return 1; 16029196d8acSJiri Slaby } 16039196d8acSJiri Slaby EXPORT_SYMBOL_GPL(serial8250_handle_irq); 16049196d8acSJiri Slaby 16059196d8acSJiri Slaby static int serial8250_default_handle_irq(struct uart_port *port) 16069196d8acSJiri Slaby { 1607d74d5d1bSSebastian Andrzej Siewior struct uart_8250_port *up = up_to_u8250p(port); 1608d74d5d1bSSebastian Andrzej Siewior unsigned int iir; 1609d74d5d1bSSebastian Andrzej Siewior int ret; 16109196d8acSJiri Slaby 1611d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_get(up); 1612d74d5d1bSSebastian Andrzej Siewior 1613d74d5d1bSSebastian Andrzej Siewior iir = serial_port_in(port, UART_IIR); 1614d74d5d1bSSebastian Andrzej Siewior ret = serial8250_handle_irq(port, iir); 1615d74d5d1bSSebastian Andrzej Siewior 1616d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_put(up); 1617d74d5d1bSSebastian Andrzej Siewior return ret; 16189196d8acSJiri Slaby } 16199196d8acSJiri Slaby 16209196d8acSJiri Slaby /* 16219196d8acSJiri Slaby * These Exar UARTs have an extra interrupt indicator that could 16229196d8acSJiri Slaby * fire for a few unimplemented interrupts. One of which is a 16239196d8acSJiri Slaby * wakeup event when coming out of sleep. Put this here just 16249196d8acSJiri Slaby * to be on the safe side that these interrupts don't go unhandled. 16259196d8acSJiri Slaby */ 16269196d8acSJiri Slaby static int exar_handle_irq(struct uart_port *port) 16279196d8acSJiri Slaby { 16289196d8acSJiri Slaby unsigned char int0, int1, int2, int3; 16299196d8acSJiri Slaby unsigned int iir = serial_port_in(port, UART_IIR); 16309196d8acSJiri Slaby int ret; 16319196d8acSJiri Slaby 16329196d8acSJiri Slaby ret = serial8250_handle_irq(port, iir); 16339196d8acSJiri Slaby 16349196d8acSJiri Slaby if ((port->type == PORT_XR17V35X) || 16359196d8acSJiri Slaby (port->type == PORT_XR17D15X)) { 16369196d8acSJiri Slaby int0 = serial_port_in(port, 0x80); 16379196d8acSJiri Slaby int1 = serial_port_in(port, 0x81); 16389196d8acSJiri Slaby int2 = serial_port_in(port, 0x82); 16399196d8acSJiri Slaby int3 = serial_port_in(port, 0x83); 16409196d8acSJiri Slaby } 16419196d8acSJiri Slaby 16429196d8acSJiri Slaby return ret; 16439196d8acSJiri Slaby } 16449196d8acSJiri Slaby 16459196d8acSJiri Slaby /* 16469196d8acSJiri Slaby * This is the serial driver's interrupt routine. 16479196d8acSJiri Slaby * 16489196d8acSJiri Slaby * Arjan thinks the old way was overly complex, so it got simplified. 16499196d8acSJiri Slaby * Alan disagrees, saying that need the complexity to handle the weird 16509196d8acSJiri Slaby * nature of ISA shared interrupts. (This is a special exception.) 16519196d8acSJiri Slaby * 16529196d8acSJiri Slaby * In order to handle ISA shared interrupts properly, we need to check 16539196d8acSJiri Slaby * that all ports have been serviced, and therefore the ISA interrupt 16549196d8acSJiri Slaby * line has been de-asserted. 16559196d8acSJiri Slaby * 16569196d8acSJiri Slaby * This means we need to loop through all ports. checking that they 16579196d8acSJiri Slaby * don't have an interrupt pending. 16589196d8acSJiri Slaby */ 16599196d8acSJiri Slaby static irqreturn_t serial8250_interrupt(int irq, void *dev_id) 16609196d8acSJiri Slaby { 16619196d8acSJiri Slaby struct irq_info *i = dev_id; 16629196d8acSJiri Slaby struct list_head *l, *end = NULL; 16639196d8acSJiri Slaby int pass_counter = 0, handled = 0; 16649196d8acSJiri Slaby 16659196d8acSJiri Slaby DEBUG_INTR("serial8250_interrupt(%d)...", irq); 16669196d8acSJiri Slaby 16679196d8acSJiri Slaby spin_lock(&i->lock); 16689196d8acSJiri Slaby 16699196d8acSJiri Slaby l = i->head; 16709196d8acSJiri Slaby do { 16719196d8acSJiri Slaby struct uart_8250_port *up; 16729196d8acSJiri Slaby struct uart_port *port; 16739196d8acSJiri Slaby 16749196d8acSJiri Slaby up = list_entry(l, struct uart_8250_port, list); 16759196d8acSJiri Slaby port = &up->port; 16769196d8acSJiri Slaby 16779196d8acSJiri Slaby if (port->handle_irq(port)) { 16789196d8acSJiri Slaby handled = 1; 16799196d8acSJiri Slaby end = NULL; 16809196d8acSJiri Slaby } else if (end == NULL) 16819196d8acSJiri Slaby end = l; 16829196d8acSJiri Slaby 16839196d8acSJiri Slaby l = l->next; 16849196d8acSJiri Slaby 16859196d8acSJiri Slaby if (l == i->head && pass_counter++ > PASS_LIMIT) { 16869196d8acSJiri Slaby /* If we hit this, we're dead. */ 16879196d8acSJiri Slaby printk_ratelimited(KERN_ERR 16889196d8acSJiri Slaby "serial8250: too much work for irq%d\n", irq); 16899196d8acSJiri Slaby break; 16909196d8acSJiri Slaby } 16919196d8acSJiri Slaby } while (l != end); 16929196d8acSJiri Slaby 16939196d8acSJiri Slaby spin_unlock(&i->lock); 16949196d8acSJiri Slaby 16959196d8acSJiri Slaby DEBUG_INTR("end.\n"); 16969196d8acSJiri Slaby 16979196d8acSJiri Slaby return IRQ_RETVAL(handled); 16989196d8acSJiri Slaby } 16999196d8acSJiri Slaby 17009196d8acSJiri Slaby /* 17019196d8acSJiri Slaby * To support ISA shared interrupts, we need to have one interrupt 17029196d8acSJiri Slaby * handler that ensures that the IRQ line has been deasserted 17039196d8acSJiri Slaby * before returning. Failing to do this will result in the IRQ 17049196d8acSJiri Slaby * line being stuck active, and, since ISA irqs are edge triggered, 17059196d8acSJiri Slaby * no more IRQs will be seen. 17069196d8acSJiri Slaby */ 17079196d8acSJiri Slaby static void serial_do_unlink(struct irq_info *i, struct uart_8250_port *up) 17089196d8acSJiri Slaby { 17099196d8acSJiri Slaby spin_lock_irq(&i->lock); 17109196d8acSJiri Slaby 17119196d8acSJiri Slaby if (!list_empty(i->head)) { 17129196d8acSJiri Slaby if (i->head == &up->list) 17139196d8acSJiri Slaby i->head = i->head->next; 17149196d8acSJiri Slaby list_del(&up->list); 17159196d8acSJiri Slaby } else { 17169196d8acSJiri Slaby BUG_ON(i->head != &up->list); 17179196d8acSJiri Slaby i->head = NULL; 17189196d8acSJiri Slaby } 17199196d8acSJiri Slaby spin_unlock_irq(&i->lock); 17209196d8acSJiri Slaby /* List empty so throw away the hash node */ 17219196d8acSJiri Slaby if (i->head == NULL) { 17229196d8acSJiri Slaby hlist_del(&i->node); 17239196d8acSJiri Slaby kfree(i); 17249196d8acSJiri Slaby } 17259196d8acSJiri Slaby } 17269196d8acSJiri Slaby 17279196d8acSJiri Slaby static int serial_link_irq_chain(struct uart_8250_port *up) 17289196d8acSJiri Slaby { 17299196d8acSJiri Slaby struct hlist_head *h; 17309196d8acSJiri Slaby struct hlist_node *n; 17319196d8acSJiri Slaby struct irq_info *i; 17329196d8acSJiri Slaby int ret, irq_flags = up->port.flags & UPF_SHARE_IRQ ? IRQF_SHARED : 0; 17339196d8acSJiri Slaby 17349196d8acSJiri Slaby mutex_lock(&hash_mutex); 17359196d8acSJiri Slaby 17369196d8acSJiri Slaby h = &irq_lists[up->port.irq % NR_IRQ_HASH]; 17379196d8acSJiri Slaby 17389196d8acSJiri Slaby hlist_for_each(n, h) { 17399196d8acSJiri Slaby i = hlist_entry(n, struct irq_info, node); 17409196d8acSJiri Slaby if (i->irq == up->port.irq) 17419196d8acSJiri Slaby break; 17429196d8acSJiri Slaby } 17439196d8acSJiri Slaby 17449196d8acSJiri Slaby if (n == NULL) { 17459196d8acSJiri Slaby i = kzalloc(sizeof(struct irq_info), GFP_KERNEL); 17469196d8acSJiri Slaby if (i == NULL) { 17479196d8acSJiri Slaby mutex_unlock(&hash_mutex); 17489196d8acSJiri Slaby return -ENOMEM; 17499196d8acSJiri Slaby } 17509196d8acSJiri Slaby spin_lock_init(&i->lock); 17519196d8acSJiri Slaby i->irq = up->port.irq; 17529196d8acSJiri Slaby hlist_add_head(&i->node, h); 17539196d8acSJiri Slaby } 17549196d8acSJiri Slaby mutex_unlock(&hash_mutex); 17559196d8acSJiri Slaby 17569196d8acSJiri Slaby spin_lock_irq(&i->lock); 17579196d8acSJiri Slaby 17589196d8acSJiri Slaby if (i->head) { 17599196d8acSJiri Slaby list_add(&up->list, i->head); 17609196d8acSJiri Slaby spin_unlock_irq(&i->lock); 17619196d8acSJiri Slaby 17629196d8acSJiri Slaby ret = 0; 17639196d8acSJiri Slaby } else { 17649196d8acSJiri Slaby INIT_LIST_HEAD(&up->list); 17659196d8acSJiri Slaby i->head = &up->list; 17669196d8acSJiri Slaby spin_unlock_irq(&i->lock); 17679196d8acSJiri Slaby irq_flags |= up->port.irqflags; 17689196d8acSJiri Slaby ret = request_irq(up->port.irq, serial8250_interrupt, 17699196d8acSJiri Slaby irq_flags, "serial", i); 17709196d8acSJiri Slaby if (ret < 0) 17719196d8acSJiri Slaby serial_do_unlink(i, up); 17729196d8acSJiri Slaby } 17739196d8acSJiri Slaby 17749196d8acSJiri Slaby return ret; 17759196d8acSJiri Slaby } 17769196d8acSJiri Slaby 17779196d8acSJiri Slaby static void serial_unlink_irq_chain(struct uart_8250_port *up) 17789196d8acSJiri Slaby { 1779bd2fe272SPaul Gortmaker /* 1780bd2fe272SPaul Gortmaker * yes, some broken gcc emit "warning: 'i' may be used uninitialized" 1781bd2fe272SPaul Gortmaker * but no, we are not going to take a patch that assigns NULL below. 1782bd2fe272SPaul Gortmaker */ 17839196d8acSJiri Slaby struct irq_info *i; 17849196d8acSJiri Slaby struct hlist_node *n; 17859196d8acSJiri Slaby struct hlist_head *h; 17869196d8acSJiri Slaby 17879196d8acSJiri Slaby mutex_lock(&hash_mutex); 17889196d8acSJiri Slaby 17899196d8acSJiri Slaby h = &irq_lists[up->port.irq % NR_IRQ_HASH]; 17909196d8acSJiri Slaby 17919196d8acSJiri Slaby hlist_for_each(n, h) { 17929196d8acSJiri Slaby i = hlist_entry(n, struct irq_info, node); 17939196d8acSJiri Slaby if (i->irq == up->port.irq) 17949196d8acSJiri Slaby break; 17959196d8acSJiri Slaby } 17969196d8acSJiri Slaby 17979196d8acSJiri Slaby BUG_ON(n == NULL); 17989196d8acSJiri Slaby BUG_ON(i->head == NULL); 17999196d8acSJiri Slaby 18009196d8acSJiri Slaby if (list_empty(i->head)) 18019196d8acSJiri Slaby free_irq(up->port.irq, i); 18029196d8acSJiri Slaby 18039196d8acSJiri Slaby serial_do_unlink(i, up); 18049196d8acSJiri Slaby mutex_unlock(&hash_mutex); 18059196d8acSJiri Slaby } 18069196d8acSJiri Slaby 18079196d8acSJiri Slaby /* 18089196d8acSJiri Slaby * This function is used to handle ports that do not have an 18099196d8acSJiri Slaby * interrupt. This doesn't work very well for 16450's, but gives 18109196d8acSJiri Slaby * barely passable results for a 16550A. (Although at the expense 18119196d8acSJiri Slaby * of much CPU overhead). 18129196d8acSJiri Slaby */ 18139196d8acSJiri Slaby static void serial8250_timeout(unsigned long data) 18149196d8acSJiri Slaby { 18159196d8acSJiri Slaby struct uart_8250_port *up = (struct uart_8250_port *)data; 18169196d8acSJiri Slaby 18179196d8acSJiri Slaby up->port.handle_irq(&up->port); 18189196d8acSJiri Slaby mod_timer(&up->timer, jiffies + uart_poll_timeout(&up->port)); 18199196d8acSJiri Slaby } 18209196d8acSJiri Slaby 18219196d8acSJiri Slaby static void serial8250_backup_timeout(unsigned long data) 18229196d8acSJiri Slaby { 18239196d8acSJiri Slaby struct uart_8250_port *up = (struct uart_8250_port *)data; 18249196d8acSJiri Slaby unsigned int iir, ier = 0, lsr; 18259196d8acSJiri Slaby unsigned long flags; 18269196d8acSJiri Slaby 18279196d8acSJiri Slaby spin_lock_irqsave(&up->port.lock, flags); 18289196d8acSJiri Slaby 18299196d8acSJiri Slaby /* 18309196d8acSJiri Slaby * Must disable interrupts or else we risk racing with the interrupt 18319196d8acSJiri Slaby * based handler. 18329196d8acSJiri Slaby */ 18339196d8acSJiri Slaby if (up->port.irq) { 18349196d8acSJiri Slaby ier = serial_in(up, UART_IER); 18359196d8acSJiri Slaby serial_out(up, UART_IER, 0); 18369196d8acSJiri Slaby } 18379196d8acSJiri Slaby 18389196d8acSJiri Slaby iir = serial_in(up, UART_IIR); 18399196d8acSJiri Slaby 18409196d8acSJiri Slaby /* 18419196d8acSJiri Slaby * This should be a safe test for anyone who doesn't trust the 18429196d8acSJiri Slaby * IIR bits on their UART, but it's specifically designed for 18439196d8acSJiri Slaby * the "Diva" UART used on the management processor on many HP 18449196d8acSJiri Slaby * ia64 and parisc boxes. 18459196d8acSJiri Slaby */ 18469196d8acSJiri Slaby lsr = serial_in(up, UART_LSR); 18479196d8acSJiri Slaby up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS; 18489196d8acSJiri Slaby if ((iir & UART_IIR_NO_INT) && (up->ier & UART_IER_THRI) && 18499196d8acSJiri Slaby (!uart_circ_empty(&up->port.state->xmit) || up->port.x_char) && 18509196d8acSJiri Slaby (lsr & UART_LSR_THRE)) { 18519196d8acSJiri Slaby iir &= ~(UART_IIR_ID | UART_IIR_NO_INT); 18529196d8acSJiri Slaby iir |= UART_IIR_THRI; 18539196d8acSJiri Slaby } 18549196d8acSJiri Slaby 18559196d8acSJiri Slaby if (!(iir & UART_IIR_NO_INT)) 18569196d8acSJiri Slaby serial8250_tx_chars(up); 18579196d8acSJiri Slaby 18589196d8acSJiri Slaby if (up->port.irq) 18599196d8acSJiri Slaby serial_out(up, UART_IER, ier); 18609196d8acSJiri Slaby 18619196d8acSJiri Slaby spin_unlock_irqrestore(&up->port.lock, flags); 18629196d8acSJiri Slaby 18639196d8acSJiri Slaby /* Standard timer interval plus 0.2s to keep the port running */ 18649196d8acSJiri Slaby mod_timer(&up->timer, 18659196d8acSJiri Slaby jiffies + uart_poll_timeout(&up->port) + HZ / 5); 18669196d8acSJiri Slaby } 18679196d8acSJiri Slaby 18689196d8acSJiri Slaby static unsigned int serial8250_tx_empty(struct uart_port *port) 18699196d8acSJiri Slaby { 1870b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 18719196d8acSJiri Slaby unsigned long flags; 18729196d8acSJiri Slaby unsigned int lsr; 18739196d8acSJiri Slaby 1874d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_get(up); 1875d74d5d1bSSebastian Andrzej Siewior 18769196d8acSJiri Slaby spin_lock_irqsave(&port->lock, flags); 18779196d8acSJiri Slaby lsr = serial_port_in(port, UART_LSR); 18789196d8acSJiri Slaby up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS; 18799196d8acSJiri Slaby spin_unlock_irqrestore(&port->lock, flags); 18809196d8acSJiri Slaby 1881d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_put(up); 1882d74d5d1bSSebastian Andrzej Siewior 18839196d8acSJiri Slaby return (lsr & BOTH_EMPTY) == BOTH_EMPTY ? TIOCSER_TEMT : 0; 18849196d8acSJiri Slaby } 18859196d8acSJiri Slaby 18869196d8acSJiri Slaby static unsigned int serial8250_get_mctrl(struct uart_port *port) 18879196d8acSJiri Slaby { 1888b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 18899196d8acSJiri Slaby unsigned int status; 18909196d8acSJiri Slaby unsigned int ret; 18919196d8acSJiri Slaby 1892d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_get(up); 18939196d8acSJiri Slaby status = serial8250_modem_status(up); 1894d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_put(up); 18959196d8acSJiri Slaby 18969196d8acSJiri Slaby ret = 0; 18979196d8acSJiri Slaby if (status & UART_MSR_DCD) 18989196d8acSJiri Slaby ret |= TIOCM_CAR; 18999196d8acSJiri Slaby if (status & UART_MSR_RI) 19009196d8acSJiri Slaby ret |= TIOCM_RNG; 19019196d8acSJiri Slaby if (status & UART_MSR_DSR) 19029196d8acSJiri Slaby ret |= TIOCM_DSR; 19039196d8acSJiri Slaby if (status & UART_MSR_CTS) 19049196d8acSJiri Slaby ret |= TIOCM_CTS; 19059196d8acSJiri Slaby return ret; 19069196d8acSJiri Slaby } 19079196d8acSJiri Slaby 19089196d8acSJiri Slaby static void serial8250_set_mctrl(struct uart_port *port, unsigned int mctrl) 19099196d8acSJiri Slaby { 1910b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 19119196d8acSJiri Slaby unsigned char mcr = 0; 19129196d8acSJiri Slaby 19139196d8acSJiri Slaby if (mctrl & TIOCM_RTS) 19149196d8acSJiri Slaby mcr |= UART_MCR_RTS; 19159196d8acSJiri Slaby if (mctrl & TIOCM_DTR) 19169196d8acSJiri Slaby mcr |= UART_MCR_DTR; 19179196d8acSJiri Slaby if (mctrl & TIOCM_OUT1) 19189196d8acSJiri Slaby mcr |= UART_MCR_OUT1; 19199196d8acSJiri Slaby if (mctrl & TIOCM_OUT2) 19209196d8acSJiri Slaby mcr |= UART_MCR_OUT2; 19219196d8acSJiri Slaby if (mctrl & TIOCM_LOOP) 19229196d8acSJiri Slaby mcr |= UART_MCR_LOOP; 19239196d8acSJiri Slaby 19249196d8acSJiri Slaby mcr = (mcr & up->mcr_mask) | up->mcr_force | up->mcr; 19259196d8acSJiri Slaby 19269196d8acSJiri Slaby serial_port_out(port, UART_MCR, mcr); 19279196d8acSJiri Slaby } 19289196d8acSJiri Slaby 19299196d8acSJiri Slaby static void serial8250_break_ctl(struct uart_port *port, int break_state) 19309196d8acSJiri Slaby { 1931b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 19329196d8acSJiri Slaby unsigned long flags; 19339196d8acSJiri Slaby 1934d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_get(up); 19359196d8acSJiri Slaby spin_lock_irqsave(&port->lock, flags); 19369196d8acSJiri Slaby if (break_state == -1) 19379196d8acSJiri Slaby up->lcr |= UART_LCR_SBC; 19389196d8acSJiri Slaby else 19399196d8acSJiri Slaby up->lcr &= ~UART_LCR_SBC; 19409196d8acSJiri Slaby serial_port_out(port, UART_LCR, up->lcr); 19419196d8acSJiri Slaby spin_unlock_irqrestore(&port->lock, flags); 1942d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_put(up); 19439196d8acSJiri Slaby } 19449196d8acSJiri Slaby 19459196d8acSJiri Slaby /* 19469196d8acSJiri Slaby * Wait for transmitter & holding register to empty 19479196d8acSJiri Slaby */ 19489196d8acSJiri Slaby static void wait_for_xmitr(struct uart_8250_port *up, int bits) 19499196d8acSJiri Slaby { 19509196d8acSJiri Slaby unsigned int status, tmout = 10000; 19519196d8acSJiri Slaby 19529196d8acSJiri Slaby /* Wait up to 10ms for the character(s) to be sent. */ 19539196d8acSJiri Slaby for (;;) { 19549196d8acSJiri Slaby status = serial_in(up, UART_LSR); 19559196d8acSJiri Slaby 19569196d8acSJiri Slaby up->lsr_saved_flags |= status & LSR_SAVE_FLAGS; 19579196d8acSJiri Slaby 19589196d8acSJiri Slaby if ((status & bits) == bits) 19599196d8acSJiri Slaby break; 19609196d8acSJiri Slaby if (--tmout == 0) 19619196d8acSJiri Slaby break; 19629196d8acSJiri Slaby udelay(1); 19639196d8acSJiri Slaby } 19649196d8acSJiri Slaby 19659196d8acSJiri Slaby /* Wait up to 1s for flow control if necessary */ 19669196d8acSJiri Slaby if (up->port.flags & UPF_CONS_FLOW) { 19679196d8acSJiri Slaby unsigned int tmout; 19689196d8acSJiri Slaby for (tmout = 1000000; tmout; tmout--) { 19699196d8acSJiri Slaby unsigned int msr = serial_in(up, UART_MSR); 19709196d8acSJiri Slaby up->msr_saved_flags |= msr & MSR_SAVE_FLAGS; 19719196d8acSJiri Slaby if (msr & UART_MSR_CTS) 19729196d8acSJiri Slaby break; 19739196d8acSJiri Slaby udelay(1); 19749196d8acSJiri Slaby touch_nmi_watchdog(); 19759196d8acSJiri Slaby } 19769196d8acSJiri Slaby } 19779196d8acSJiri Slaby } 19789196d8acSJiri Slaby 19799196d8acSJiri Slaby #ifdef CONFIG_CONSOLE_POLL 19809196d8acSJiri Slaby /* 19819196d8acSJiri Slaby * Console polling routines for writing and reading from the uart while 19829196d8acSJiri Slaby * in an interrupt or debug context. 19839196d8acSJiri Slaby */ 19849196d8acSJiri Slaby 19859196d8acSJiri Slaby static int serial8250_get_poll_char(struct uart_port *port) 19869196d8acSJiri Slaby { 1987d74d5d1bSSebastian Andrzej Siewior struct uart_8250_port *up = up_to_u8250p(port); 1988d74d5d1bSSebastian Andrzej Siewior unsigned char lsr; 1989d74d5d1bSSebastian Andrzej Siewior int status; 19909196d8acSJiri Slaby 1991d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_get(up); 19929196d8acSJiri Slaby 1993d74d5d1bSSebastian Andrzej Siewior lsr = serial_port_in(port, UART_LSR); 1994d74d5d1bSSebastian Andrzej Siewior 1995d74d5d1bSSebastian Andrzej Siewior if (!(lsr & UART_LSR_DR)) { 1996d74d5d1bSSebastian Andrzej Siewior status = NO_POLL_CHAR; 1997d74d5d1bSSebastian Andrzej Siewior goto out; 1998d74d5d1bSSebastian Andrzej Siewior } 1999d74d5d1bSSebastian Andrzej Siewior 2000d74d5d1bSSebastian Andrzej Siewior status = serial_port_in(port, UART_RX); 2001d74d5d1bSSebastian Andrzej Siewior out: 2002d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_put(up); 2003d74d5d1bSSebastian Andrzej Siewior return status; 20049196d8acSJiri Slaby } 20059196d8acSJiri Slaby 20069196d8acSJiri Slaby 20079196d8acSJiri Slaby static void serial8250_put_poll_char(struct uart_port *port, 20089196d8acSJiri Slaby unsigned char c) 20099196d8acSJiri Slaby { 20109196d8acSJiri Slaby unsigned int ier; 2011b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 20129196d8acSJiri Slaby 2013d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_get(up); 20149196d8acSJiri Slaby /* 20159196d8acSJiri Slaby * First save the IER then disable the interrupts 20169196d8acSJiri Slaby */ 20179196d8acSJiri Slaby ier = serial_port_in(port, UART_IER); 20189196d8acSJiri Slaby if (up->capabilities & UART_CAP_UUE) 20199196d8acSJiri Slaby serial_port_out(port, UART_IER, UART_IER_UUE); 20209196d8acSJiri Slaby else 20219196d8acSJiri Slaby serial_port_out(port, UART_IER, 0); 20229196d8acSJiri Slaby 20239196d8acSJiri Slaby wait_for_xmitr(up, BOTH_EMPTY); 20249196d8acSJiri Slaby /* 20259196d8acSJiri Slaby * Send the character out. 20269196d8acSJiri Slaby */ 20279196d8acSJiri Slaby serial_port_out(port, UART_TX, c); 20289196d8acSJiri Slaby 20299196d8acSJiri Slaby /* 20309196d8acSJiri Slaby * Finally, wait for transmitter to become empty 20319196d8acSJiri Slaby * and restore the IER 20329196d8acSJiri Slaby */ 20339196d8acSJiri Slaby wait_for_xmitr(up, BOTH_EMPTY); 20349196d8acSJiri Slaby serial_port_out(port, UART_IER, ier); 2035d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_put(up); 20369196d8acSJiri Slaby } 20379196d8acSJiri Slaby 20389196d8acSJiri Slaby #endif /* CONFIG_CONSOLE_POLL */ 20399196d8acSJiri Slaby 2040b99b121bSSebastian Andrzej Siewior int serial8250_do_startup(struct uart_port *port) 20419196d8acSJiri Slaby { 2042b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 20439196d8acSJiri Slaby unsigned long flags; 20449196d8acSJiri Slaby unsigned char lsr, iir; 20459196d8acSJiri Slaby int retval; 20469196d8acSJiri Slaby 20479196d8acSJiri Slaby if (port->type == PORT_8250_CIR) 20489196d8acSJiri Slaby return -ENODEV; 20499196d8acSJiri Slaby 20509196d8acSJiri Slaby if (!port->fifosize) 20519196d8acSJiri Slaby port->fifosize = uart_config[port->type].fifo_size; 20529196d8acSJiri Slaby if (!up->tx_loadsz) 20539196d8acSJiri Slaby up->tx_loadsz = uart_config[port->type].tx_loadsz; 20549196d8acSJiri Slaby if (!up->capabilities) 20559196d8acSJiri Slaby up->capabilities = uart_config[port->type].flags; 20569196d8acSJiri Slaby up->mcr = 0; 20579196d8acSJiri Slaby 20589196d8acSJiri Slaby if (port->iotype != up->cur_iotype) 20599196d8acSJiri Slaby set_io_from_upio(port); 20609196d8acSJiri Slaby 2061d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_get(up); 20629196d8acSJiri Slaby if (port->type == PORT_16C950) { 20639196d8acSJiri Slaby /* Wake up and initialize UART */ 20649196d8acSJiri Slaby up->acr = 0; 20659196d8acSJiri Slaby serial_port_out(port, UART_LCR, UART_LCR_CONF_MODE_B); 20669196d8acSJiri Slaby serial_port_out(port, UART_EFR, UART_EFR_ECB); 20679196d8acSJiri Slaby serial_port_out(port, UART_IER, 0); 20689196d8acSJiri Slaby serial_port_out(port, UART_LCR, 0); 20699196d8acSJiri Slaby serial_icr_write(up, UART_CSR, 0); /* Reset the UART */ 20709196d8acSJiri Slaby serial_port_out(port, UART_LCR, UART_LCR_CONF_MODE_B); 20719196d8acSJiri Slaby serial_port_out(port, UART_EFR, UART_EFR_ECB); 20729196d8acSJiri Slaby serial_port_out(port, UART_LCR, 0); 20739196d8acSJiri Slaby } 20749196d8acSJiri Slaby 20759196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_RSA 20769196d8acSJiri Slaby /* 20779196d8acSJiri Slaby * If this is an RSA port, see if we can kick it up to the 20789196d8acSJiri Slaby * higher speed clock. 20799196d8acSJiri Slaby */ 20809196d8acSJiri Slaby enable_rsa(up); 20819196d8acSJiri Slaby #endif 20829196d8acSJiri Slaby /* 20839196d8acSJiri Slaby * Clear the FIFO buffers and disable them. 20849196d8acSJiri Slaby * (they will be reenabled in set_termios()) 20859196d8acSJiri Slaby */ 20869196d8acSJiri Slaby serial8250_clear_fifos(up); 20879196d8acSJiri Slaby 20889196d8acSJiri Slaby /* 20899196d8acSJiri Slaby * Clear the interrupt registers. 20909196d8acSJiri Slaby */ 20910aa525d1SSebastian Andrzej Siewior if (serial_port_in(port, UART_LSR) & UART_LSR_DR) 20929196d8acSJiri Slaby serial_port_in(port, UART_RX); 20939196d8acSJiri Slaby serial_port_in(port, UART_IIR); 20949196d8acSJiri Slaby serial_port_in(port, UART_MSR); 20959196d8acSJiri Slaby 20969196d8acSJiri Slaby /* 20979196d8acSJiri Slaby * At this point, there's no way the LSR could still be 0xff; 20989196d8acSJiri Slaby * if it is, then bail out, because there's likely no UART 20999196d8acSJiri Slaby * here. 21009196d8acSJiri Slaby */ 21019196d8acSJiri Slaby if (!(port->flags & UPF_BUGGY_UART) && 21029196d8acSJiri Slaby (serial_port_in(port, UART_LSR) == 0xff)) { 21039196d8acSJiri Slaby printk_ratelimited(KERN_INFO "ttyS%d: LSR safety check engaged!\n", 21049196d8acSJiri Slaby serial_index(port)); 2105d74d5d1bSSebastian Andrzej Siewior retval = -ENODEV; 2106d74d5d1bSSebastian Andrzej Siewior goto out; 21079196d8acSJiri Slaby } 21089196d8acSJiri Slaby 21099196d8acSJiri Slaby /* 21109196d8acSJiri Slaby * For a XR16C850, we need to set the trigger levels 21119196d8acSJiri Slaby */ 21129196d8acSJiri Slaby if (port->type == PORT_16850) { 21139196d8acSJiri Slaby unsigned char fctr; 21149196d8acSJiri Slaby 21159196d8acSJiri Slaby serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 21169196d8acSJiri Slaby 21179196d8acSJiri Slaby fctr = serial_in(up, UART_FCTR) & ~(UART_FCTR_RX|UART_FCTR_TX); 21189196d8acSJiri Slaby serial_port_out(port, UART_FCTR, 21199196d8acSJiri Slaby fctr | UART_FCTR_TRGD | UART_FCTR_RX); 21209196d8acSJiri Slaby serial_port_out(port, UART_TRG, UART_TRG_96); 21219196d8acSJiri Slaby serial_port_out(port, UART_FCTR, 21229196d8acSJiri Slaby fctr | UART_FCTR_TRGD | UART_FCTR_TX); 21239196d8acSJiri Slaby serial_port_out(port, UART_TRG, UART_TRG_96); 21249196d8acSJiri Slaby 21259196d8acSJiri Slaby serial_port_out(port, UART_LCR, 0); 21269196d8acSJiri Slaby } 21279196d8acSJiri Slaby 21289196d8acSJiri Slaby if (port->irq) { 21299196d8acSJiri Slaby unsigned char iir1; 21309196d8acSJiri Slaby /* 21319196d8acSJiri Slaby * Test for UARTs that do not reassert THRE when the 21329196d8acSJiri Slaby * transmitter is idle and the interrupt has already 21339196d8acSJiri Slaby * been cleared. Real 16550s should always reassert 21349196d8acSJiri Slaby * this interrupt whenever the transmitter is idle and 21359196d8acSJiri Slaby * the interrupt is enabled. Delays are necessary to 21369196d8acSJiri Slaby * allow register changes to become visible. 21379196d8acSJiri Slaby */ 21389196d8acSJiri Slaby spin_lock_irqsave(&port->lock, flags); 21399196d8acSJiri Slaby if (up->port.irqflags & IRQF_SHARED) 21409196d8acSJiri Slaby disable_irq_nosync(port->irq); 21419196d8acSJiri Slaby 21429196d8acSJiri Slaby wait_for_xmitr(up, UART_LSR_THRE); 21439196d8acSJiri Slaby serial_port_out_sync(port, UART_IER, UART_IER_THRI); 21449196d8acSJiri Slaby udelay(1); /* allow THRE to set */ 21459196d8acSJiri Slaby iir1 = serial_port_in(port, UART_IIR); 21469196d8acSJiri Slaby serial_port_out(port, UART_IER, 0); 21479196d8acSJiri Slaby serial_port_out_sync(port, UART_IER, UART_IER_THRI); 21489196d8acSJiri Slaby udelay(1); /* allow a working UART time to re-assert THRE */ 21499196d8acSJiri Slaby iir = serial_port_in(port, UART_IIR); 21509196d8acSJiri Slaby serial_port_out(port, UART_IER, 0); 21519196d8acSJiri Slaby 21529196d8acSJiri Slaby if (port->irqflags & IRQF_SHARED) 21539196d8acSJiri Slaby enable_irq(port->irq); 21549196d8acSJiri Slaby spin_unlock_irqrestore(&port->lock, flags); 21559196d8acSJiri Slaby 21569196d8acSJiri Slaby /* 21579196d8acSJiri Slaby * If the interrupt is not reasserted, or we otherwise 21589196d8acSJiri Slaby * don't trust the iir, setup a timer to kick the UART 21599196d8acSJiri Slaby * on a regular basis. 21609196d8acSJiri Slaby */ 21619196d8acSJiri Slaby if ((!(iir1 & UART_IIR_NO_INT) && (iir & UART_IIR_NO_INT)) || 21629196d8acSJiri Slaby up->port.flags & UPF_BUG_THRE) { 21639196d8acSJiri Slaby up->bugs |= UART_BUG_THRE; 21649196d8acSJiri Slaby pr_debug("ttyS%d - using backup timer\n", 21659196d8acSJiri Slaby serial_index(port)); 21669196d8acSJiri Slaby } 21679196d8acSJiri Slaby } 21689196d8acSJiri Slaby 21699196d8acSJiri Slaby /* 21709196d8acSJiri Slaby * The above check will only give an accurate result the first time 21719196d8acSJiri Slaby * the port is opened so this value needs to be preserved. 21729196d8acSJiri Slaby */ 21739196d8acSJiri Slaby if (up->bugs & UART_BUG_THRE) { 21749196d8acSJiri Slaby up->timer.function = serial8250_backup_timeout; 21759196d8acSJiri Slaby up->timer.data = (unsigned long)up; 21769196d8acSJiri Slaby mod_timer(&up->timer, jiffies + 21779196d8acSJiri Slaby uart_poll_timeout(port) + HZ / 5); 21789196d8acSJiri Slaby } 21799196d8acSJiri Slaby 21809196d8acSJiri Slaby /* 21819196d8acSJiri Slaby * If the "interrupt" for this port doesn't correspond with any 21829196d8acSJiri Slaby * hardware interrupt, we use a timer-based system. The original 21839196d8acSJiri Slaby * driver used to do this with IRQ0. 21849196d8acSJiri Slaby */ 21859196d8acSJiri Slaby if (!port->irq) { 21869196d8acSJiri Slaby up->timer.data = (unsigned long)up; 21879196d8acSJiri Slaby mod_timer(&up->timer, jiffies + uart_poll_timeout(port)); 21889196d8acSJiri Slaby } else { 21899196d8acSJiri Slaby retval = serial_link_irq_chain(up); 21909196d8acSJiri Slaby if (retval) 2191d74d5d1bSSebastian Andrzej Siewior goto out; 21929196d8acSJiri Slaby } 21939196d8acSJiri Slaby 21949196d8acSJiri Slaby /* 21959196d8acSJiri Slaby * Now, initialize the UART 21969196d8acSJiri Slaby */ 21979196d8acSJiri Slaby serial_port_out(port, UART_LCR, UART_LCR_WLEN8); 21989196d8acSJiri Slaby 21999196d8acSJiri Slaby spin_lock_irqsave(&port->lock, flags); 22009196d8acSJiri Slaby if (up->port.flags & UPF_FOURPORT) { 22019196d8acSJiri Slaby if (!up->port.irq) 22029196d8acSJiri Slaby up->port.mctrl |= TIOCM_OUT1; 22039196d8acSJiri Slaby } else 22049196d8acSJiri Slaby /* 22059196d8acSJiri Slaby * Most PC uarts need OUT2 raised to enable interrupts. 22069196d8acSJiri Slaby */ 22079196d8acSJiri Slaby if (port->irq) 22089196d8acSJiri Slaby up->port.mctrl |= TIOCM_OUT2; 22099196d8acSJiri Slaby 22109196d8acSJiri Slaby serial8250_set_mctrl(port, port->mctrl); 22119196d8acSJiri Slaby 22129196d8acSJiri Slaby /* Serial over Lan (SoL) hack: 22139196d8acSJiri Slaby Intel 8257x Gigabit ethernet chips have a 22149196d8acSJiri Slaby 16550 emulation, to be used for Serial Over Lan. 22159196d8acSJiri Slaby Those chips take a longer time than a normal 22169196d8acSJiri Slaby serial device to signalize that a transmission 22179196d8acSJiri Slaby data was queued. Due to that, the above test generally 22189196d8acSJiri Slaby fails. One solution would be to delay the reading of 22199196d8acSJiri Slaby iir. However, this is not reliable, since the timeout 22209196d8acSJiri Slaby is variable. So, let's just don't test if we receive 22219196d8acSJiri Slaby TX irq. This way, we'll never enable UART_BUG_TXEN. 22229196d8acSJiri Slaby */ 22239196d8acSJiri Slaby if (skip_txen_test || up->port.flags & UPF_NO_TXEN_TEST) 22249196d8acSJiri Slaby goto dont_test_tx_en; 22259196d8acSJiri Slaby 22269196d8acSJiri Slaby /* 22279196d8acSJiri Slaby * Do a quick test to see if we receive an 22289196d8acSJiri Slaby * interrupt when we enable the TX irq. 22299196d8acSJiri Slaby */ 22309196d8acSJiri Slaby serial_port_out(port, UART_IER, UART_IER_THRI); 22319196d8acSJiri Slaby lsr = serial_port_in(port, UART_LSR); 22329196d8acSJiri Slaby iir = serial_port_in(port, UART_IIR); 22339196d8acSJiri Slaby serial_port_out(port, UART_IER, 0); 22349196d8acSJiri Slaby 22359196d8acSJiri Slaby if (lsr & UART_LSR_TEMT && iir & UART_IIR_NO_INT) { 22369196d8acSJiri Slaby if (!(up->bugs & UART_BUG_TXEN)) { 22379196d8acSJiri Slaby up->bugs |= UART_BUG_TXEN; 22389196d8acSJiri Slaby pr_debug("ttyS%d - enabling bad tx status workarounds\n", 22399196d8acSJiri Slaby serial_index(port)); 22409196d8acSJiri Slaby } 22419196d8acSJiri Slaby } else { 22429196d8acSJiri Slaby up->bugs &= ~UART_BUG_TXEN; 22439196d8acSJiri Slaby } 22449196d8acSJiri Slaby 22459196d8acSJiri Slaby dont_test_tx_en: 22469196d8acSJiri Slaby spin_unlock_irqrestore(&port->lock, flags); 22479196d8acSJiri Slaby 22489196d8acSJiri Slaby /* 22499196d8acSJiri Slaby * Clear the interrupt registers again for luck, and clear the 22509196d8acSJiri Slaby * saved flags to avoid getting false values from polling 22519196d8acSJiri Slaby * routines or the previous session. 22529196d8acSJiri Slaby */ 22530aa525d1SSebastian Andrzej Siewior if (serial_port_in(port, UART_LSR) & UART_LSR_DR) 22549196d8acSJiri Slaby serial_port_in(port, UART_RX); 22559196d8acSJiri Slaby serial_port_in(port, UART_IIR); 22569196d8acSJiri Slaby serial_port_in(port, UART_MSR); 22579196d8acSJiri Slaby up->lsr_saved_flags = 0; 22589196d8acSJiri Slaby up->msr_saved_flags = 0; 22599196d8acSJiri Slaby 22609196d8acSJiri Slaby /* 22619196d8acSJiri Slaby * Request DMA channels for both RX and TX. 22629196d8acSJiri Slaby */ 22639196d8acSJiri Slaby if (up->dma) { 22649196d8acSJiri Slaby retval = serial8250_request_dma(up); 22659196d8acSJiri Slaby if (retval) { 22669196d8acSJiri Slaby pr_warn_ratelimited("ttyS%d - failed to request DMA\n", 22679196d8acSJiri Slaby serial_index(port)); 22689196d8acSJiri Slaby up->dma = NULL; 22699196d8acSJiri Slaby } 22709196d8acSJiri Slaby } 22719196d8acSJiri Slaby 22729196d8acSJiri Slaby /* 22739196d8acSJiri Slaby * Finally, enable interrupts. Note: Modem status interrupts 22749196d8acSJiri Slaby * are set via set_termios(), which will be occurring imminently 22759196d8acSJiri Slaby * anyway, so we don't enable them here. 22769196d8acSJiri Slaby */ 22779196d8acSJiri Slaby up->ier = UART_IER_RLSI | UART_IER_RDI; 22789196d8acSJiri Slaby serial_port_out(port, UART_IER, up->ier); 22799196d8acSJiri Slaby 22809196d8acSJiri Slaby if (port->flags & UPF_FOURPORT) { 22819196d8acSJiri Slaby unsigned int icp; 22829196d8acSJiri Slaby /* 22839196d8acSJiri Slaby * Enable interrupts on the AST Fourport board 22849196d8acSJiri Slaby */ 22859196d8acSJiri Slaby icp = (port->iobase & 0xfe0) | 0x01f; 22869196d8acSJiri Slaby outb_p(0x80, icp); 22879196d8acSJiri Slaby inb_p(icp); 22889196d8acSJiri Slaby } 2289d74d5d1bSSebastian Andrzej Siewior retval = 0; 2290d74d5d1bSSebastian Andrzej Siewior out: 2291d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_put(up); 2292d74d5d1bSSebastian Andrzej Siewior return retval; 22939196d8acSJiri Slaby } 2294b99b121bSSebastian Andrzej Siewior EXPORT_SYMBOL_GPL(serial8250_do_startup); 22959196d8acSJiri Slaby 2296b99b121bSSebastian Andrzej Siewior static int serial8250_startup(struct uart_port *port) 2297b99b121bSSebastian Andrzej Siewior { 2298b99b121bSSebastian Andrzej Siewior if (port->startup) 2299b99b121bSSebastian Andrzej Siewior return port->startup(port); 2300b99b121bSSebastian Andrzej Siewior return serial8250_do_startup(port); 2301b99b121bSSebastian Andrzej Siewior } 2302b99b121bSSebastian Andrzej Siewior 2303b99b121bSSebastian Andrzej Siewior void serial8250_do_shutdown(struct uart_port *port) 23049196d8acSJiri Slaby { 2305b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 23069196d8acSJiri Slaby unsigned long flags; 23079196d8acSJiri Slaby 2308d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_get(up); 23099196d8acSJiri Slaby /* 23109196d8acSJiri Slaby * Disable interrupts from this port 23119196d8acSJiri Slaby */ 23129196d8acSJiri Slaby up->ier = 0; 23139196d8acSJiri Slaby serial_port_out(port, UART_IER, 0); 23149196d8acSJiri Slaby 23159196d8acSJiri Slaby if (up->dma) 23169196d8acSJiri Slaby serial8250_release_dma(up); 23179196d8acSJiri Slaby 23189196d8acSJiri Slaby spin_lock_irqsave(&port->lock, flags); 23199196d8acSJiri Slaby if (port->flags & UPF_FOURPORT) { 23209196d8acSJiri Slaby /* reset interrupts on the AST Fourport board */ 23219196d8acSJiri Slaby inb((port->iobase & 0xfe0) | 0x1f); 23229196d8acSJiri Slaby port->mctrl |= TIOCM_OUT1; 23239196d8acSJiri Slaby } else 23249196d8acSJiri Slaby port->mctrl &= ~TIOCM_OUT2; 23259196d8acSJiri Slaby 23269196d8acSJiri Slaby serial8250_set_mctrl(port, port->mctrl); 23279196d8acSJiri Slaby spin_unlock_irqrestore(&port->lock, flags); 23289196d8acSJiri Slaby 23299196d8acSJiri Slaby /* 23309196d8acSJiri Slaby * Disable break condition and FIFOs 23319196d8acSJiri Slaby */ 23329196d8acSJiri Slaby serial_port_out(port, UART_LCR, 23339196d8acSJiri Slaby serial_port_in(port, UART_LCR) & ~UART_LCR_SBC); 23349196d8acSJiri Slaby serial8250_clear_fifos(up); 23359196d8acSJiri Slaby 23369196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_RSA 23379196d8acSJiri Slaby /* 23389196d8acSJiri Slaby * Reset the RSA board back to 115kbps compat mode. 23399196d8acSJiri Slaby */ 23409196d8acSJiri Slaby disable_rsa(up); 23419196d8acSJiri Slaby #endif 23429196d8acSJiri Slaby 23439196d8acSJiri Slaby /* 23449196d8acSJiri Slaby * Read data port to reset things, and then unlink from 23459196d8acSJiri Slaby * the IRQ chain. 23469196d8acSJiri Slaby */ 23470aa525d1SSebastian Andrzej Siewior if (serial_port_in(port, UART_LSR) & UART_LSR_DR) 23489196d8acSJiri Slaby serial_port_in(port, UART_RX); 2349d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_put(up); 23509196d8acSJiri Slaby 23519196d8acSJiri Slaby del_timer_sync(&up->timer); 23529196d8acSJiri Slaby up->timer.function = serial8250_timeout; 23539196d8acSJiri Slaby if (port->irq) 23549196d8acSJiri Slaby serial_unlink_irq_chain(up); 23559196d8acSJiri Slaby } 2356b99b121bSSebastian Andrzej Siewior EXPORT_SYMBOL_GPL(serial8250_do_shutdown); 2357b99b121bSSebastian Andrzej Siewior 2358b99b121bSSebastian Andrzej Siewior static void serial8250_shutdown(struct uart_port *port) 2359b99b121bSSebastian Andrzej Siewior { 2360b99b121bSSebastian Andrzej Siewior if (port->shutdown) 2361b99b121bSSebastian Andrzej Siewior port->shutdown(port); 2362b99b121bSSebastian Andrzej Siewior else 2363b99b121bSSebastian Andrzej Siewior serial8250_do_shutdown(port); 2364b99b121bSSebastian Andrzej Siewior } 23659196d8acSJiri Slaby 23669196d8acSJiri Slaby static unsigned int serial8250_get_divisor(struct uart_port *port, unsigned int baud) 23679196d8acSJiri Slaby { 23689196d8acSJiri Slaby unsigned int quot; 23699196d8acSJiri Slaby 23709196d8acSJiri Slaby /* 23719196d8acSJiri Slaby * Handle magic divisors for baud rates above baud_base on 23729196d8acSJiri Slaby * SMSC SuperIO chips. 23739196d8acSJiri Slaby */ 23749196d8acSJiri Slaby if ((port->flags & UPF_MAGIC_MULTIPLIER) && 23759196d8acSJiri Slaby baud == (port->uartclk/4)) 23769196d8acSJiri Slaby quot = 0x8001; 23779196d8acSJiri Slaby else if ((port->flags & UPF_MAGIC_MULTIPLIER) && 23789196d8acSJiri Slaby baud == (port->uartclk/8)) 23799196d8acSJiri Slaby quot = 0x8002; 23809196d8acSJiri Slaby else 23819196d8acSJiri Slaby quot = uart_get_divisor(port, baud); 23829196d8acSJiri Slaby 23839196d8acSJiri Slaby return quot; 23849196d8acSJiri Slaby } 23859196d8acSJiri Slaby 23869196d8acSJiri Slaby void 23879196d8acSJiri Slaby serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios, 23889196d8acSJiri Slaby struct ktermios *old) 23899196d8acSJiri Slaby { 2390b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 2391aef9a7bdSYoshihiro YUNOMAE unsigned char cval; 23929196d8acSJiri Slaby unsigned long flags; 23939196d8acSJiri Slaby unsigned int baud, quot; 23949196d8acSJiri Slaby 23959196d8acSJiri Slaby switch (termios->c_cflag & CSIZE) { 23969196d8acSJiri Slaby case CS5: 23979196d8acSJiri Slaby cval = UART_LCR_WLEN5; 23989196d8acSJiri Slaby break; 23999196d8acSJiri Slaby case CS6: 24009196d8acSJiri Slaby cval = UART_LCR_WLEN6; 24019196d8acSJiri Slaby break; 24029196d8acSJiri Slaby case CS7: 24039196d8acSJiri Slaby cval = UART_LCR_WLEN7; 24049196d8acSJiri Slaby break; 24059196d8acSJiri Slaby default: 24069196d8acSJiri Slaby case CS8: 24079196d8acSJiri Slaby cval = UART_LCR_WLEN8; 24089196d8acSJiri Slaby break; 24099196d8acSJiri Slaby } 24109196d8acSJiri Slaby 24119196d8acSJiri Slaby if (termios->c_cflag & CSTOPB) 24129196d8acSJiri Slaby cval |= UART_LCR_STOP; 24139196d8acSJiri Slaby if (termios->c_cflag & PARENB) { 24149196d8acSJiri Slaby cval |= UART_LCR_PARITY; 24159196d8acSJiri Slaby if (up->bugs & UART_BUG_PARITY) 2416aef9a7bdSYoshihiro YUNOMAE up->fifo_bug = true; 24179196d8acSJiri Slaby } 24189196d8acSJiri Slaby if (!(termios->c_cflag & PARODD)) 24199196d8acSJiri Slaby cval |= UART_LCR_EPAR; 24209196d8acSJiri Slaby #ifdef CMSPAR 24219196d8acSJiri Slaby if (termios->c_cflag & CMSPAR) 24229196d8acSJiri Slaby cval |= UART_LCR_SPAR; 24239196d8acSJiri Slaby #endif 24249196d8acSJiri Slaby 24259196d8acSJiri Slaby /* 24269196d8acSJiri Slaby * Ask the core to calculate the divisor for us. 24279196d8acSJiri Slaby */ 24289196d8acSJiri Slaby baud = uart_get_baud_rate(port, termios, old, 24299196d8acSJiri Slaby port->uartclk / 16 / 0xffff, 24309196d8acSJiri Slaby port->uartclk / 16); 24319196d8acSJiri Slaby quot = serial8250_get_divisor(port, baud); 24329196d8acSJiri Slaby 24339196d8acSJiri Slaby /* 24349196d8acSJiri Slaby * Oxford Semi 952 rev B workaround 24359196d8acSJiri Slaby */ 24369196d8acSJiri Slaby if (up->bugs & UART_BUG_QUOT && (quot & 0xff) == 0) 24379196d8acSJiri Slaby quot++; 24389196d8acSJiri Slaby 24399196d8acSJiri Slaby if (up->capabilities & UART_CAP_FIFO && port->fifosize > 1) { 2440aef9a7bdSYoshihiro YUNOMAE /* NOTE: If fifo_bug is not set, a user can set RX_trigger. */ 2441aef9a7bdSYoshihiro YUNOMAE if ((baud < 2400 && !up->dma) || up->fifo_bug) { 2442aef9a7bdSYoshihiro YUNOMAE up->fcr &= ~UART_FCR_TRIGGER_MASK; 2443aef9a7bdSYoshihiro YUNOMAE up->fcr |= UART_FCR_TRIGGER_1; 24449196d8acSJiri Slaby } 24459196d8acSJiri Slaby } 24469196d8acSJiri Slaby 24479196d8acSJiri Slaby /* 24489196d8acSJiri Slaby * MCR-based auto flow control. When AFE is enabled, RTS will be 24499196d8acSJiri Slaby * deasserted when the receive FIFO contains more characters than 24509196d8acSJiri Slaby * the trigger, or the MCR RTS bit is cleared. In the case where 24519196d8acSJiri Slaby * the remote UART is not using CTS auto flow control, we must 24529196d8acSJiri Slaby * have sufficient FIFO entries for the latency of the remote 2453a6eec92eSPeter Hurley * UART to respond. IOW, at least 32 bytes of FIFO. 24549196d8acSJiri Slaby */ 2455a6eec92eSPeter Hurley if (up->capabilities & UART_CAP_AFE && port->fifosize >= 32) { 24569196d8acSJiri Slaby up->mcr &= ~UART_MCR_AFE; 24579196d8acSJiri Slaby if (termios->c_cflag & CRTSCTS) 24589196d8acSJiri Slaby up->mcr |= UART_MCR_AFE; 24599196d8acSJiri Slaby } 24609196d8acSJiri Slaby 24619196d8acSJiri Slaby /* 24629196d8acSJiri Slaby * Ok, we're now changing the port state. Do it with 24639196d8acSJiri Slaby * interrupts disabled. 24649196d8acSJiri Slaby */ 2465d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_get(up); 24669196d8acSJiri Slaby spin_lock_irqsave(&port->lock, flags); 24679196d8acSJiri Slaby 24689196d8acSJiri Slaby /* 24699196d8acSJiri Slaby * Update the per-port timeout. 24709196d8acSJiri Slaby */ 24719196d8acSJiri Slaby uart_update_timeout(port, termios->c_cflag, baud); 24729196d8acSJiri Slaby 24739196d8acSJiri Slaby port->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; 24749196d8acSJiri Slaby if (termios->c_iflag & INPCK) 24759196d8acSJiri Slaby port->read_status_mask |= UART_LSR_FE | UART_LSR_PE; 2476ef8b9ddcSPeter Hurley if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK)) 24779196d8acSJiri Slaby port->read_status_mask |= UART_LSR_BI; 24789196d8acSJiri Slaby 24799196d8acSJiri Slaby /* 24809196d8acSJiri Slaby * Characteres to ignore 24819196d8acSJiri Slaby */ 24829196d8acSJiri Slaby port->ignore_status_mask = 0; 24839196d8acSJiri Slaby if (termios->c_iflag & IGNPAR) 24849196d8acSJiri Slaby port->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; 24859196d8acSJiri Slaby if (termios->c_iflag & IGNBRK) { 24869196d8acSJiri Slaby port->ignore_status_mask |= UART_LSR_BI; 24879196d8acSJiri Slaby /* 24889196d8acSJiri Slaby * If we're ignoring parity and break indicators, 24899196d8acSJiri Slaby * ignore overruns too (for real raw support). 24909196d8acSJiri Slaby */ 24919196d8acSJiri Slaby if (termios->c_iflag & IGNPAR) 24929196d8acSJiri Slaby port->ignore_status_mask |= UART_LSR_OE; 24939196d8acSJiri Slaby } 24949196d8acSJiri Slaby 24959196d8acSJiri Slaby /* 24969196d8acSJiri Slaby * ignore all characters if CREAD is not set 24979196d8acSJiri Slaby */ 24989196d8acSJiri Slaby if ((termios->c_cflag & CREAD) == 0) 24999196d8acSJiri Slaby port->ignore_status_mask |= UART_LSR_DR; 25009196d8acSJiri Slaby 25019196d8acSJiri Slaby /* 25029196d8acSJiri Slaby * CTS flow control flag and modem status interrupts 25039196d8acSJiri Slaby */ 25049196d8acSJiri Slaby up->ier &= ~UART_IER_MSI; 25059196d8acSJiri Slaby if (!(up->bugs & UART_BUG_NOMSR) && 25069196d8acSJiri Slaby UART_ENABLE_MS(&up->port, termios->c_cflag)) 25079196d8acSJiri Slaby up->ier |= UART_IER_MSI; 25089196d8acSJiri Slaby if (up->capabilities & UART_CAP_UUE) 25099196d8acSJiri Slaby up->ier |= UART_IER_UUE; 25109196d8acSJiri Slaby if (up->capabilities & UART_CAP_RTOIE) 25119196d8acSJiri Slaby up->ier |= UART_IER_RTOIE; 25129196d8acSJiri Slaby 25139196d8acSJiri Slaby serial_port_out(port, UART_IER, up->ier); 25149196d8acSJiri Slaby 25159196d8acSJiri Slaby if (up->capabilities & UART_CAP_EFR) { 25169196d8acSJiri Slaby unsigned char efr = 0; 25179196d8acSJiri Slaby /* 25189196d8acSJiri Slaby * TI16C752/Startech hardware flow control. FIXME: 25199196d8acSJiri Slaby * - TI16C752 requires control thresholds to be set. 25209196d8acSJiri Slaby * - UART_MCR_RTS is ineffective if auto-RTS mode is enabled. 25219196d8acSJiri Slaby */ 25229196d8acSJiri Slaby if (termios->c_cflag & CRTSCTS) 25239196d8acSJiri Slaby efr |= UART_EFR_CTS; 25249196d8acSJiri Slaby 25259196d8acSJiri Slaby serial_port_out(port, UART_LCR, UART_LCR_CONF_MODE_B); 25269196d8acSJiri Slaby if (port->flags & UPF_EXAR_EFR) 25279196d8acSJiri Slaby serial_port_out(port, UART_XR_EFR, efr); 25289196d8acSJiri Slaby else 25299196d8acSJiri Slaby serial_port_out(port, UART_EFR, efr); 25309196d8acSJiri Slaby } 25319196d8acSJiri Slaby 25329196d8acSJiri Slaby /* Workaround to enable 115200 baud on OMAP1510 internal ports */ 25339196d8acSJiri Slaby if (is_omap1510_8250(up)) { 25349196d8acSJiri Slaby if (baud == 115200) { 25359196d8acSJiri Slaby quot = 1; 25369196d8acSJiri Slaby serial_port_out(port, UART_OMAP_OSC_12M_SEL, 1); 25379196d8acSJiri Slaby } else 25389196d8acSJiri Slaby serial_port_out(port, UART_OMAP_OSC_12M_SEL, 0); 25399196d8acSJiri Slaby } 25409196d8acSJiri Slaby 25419196d8acSJiri Slaby /* 25429196d8acSJiri Slaby * For NatSemi, switch to bank 2 not bank 1, to avoid resetting EXCR2, 25439196d8acSJiri Slaby * otherwise just set DLAB 25449196d8acSJiri Slaby */ 25459196d8acSJiri Slaby if (up->capabilities & UART_NATSEMI) 25469196d8acSJiri Slaby serial_port_out(port, UART_LCR, 0xe0); 25479196d8acSJiri Slaby else 25489196d8acSJiri Slaby serial_port_out(port, UART_LCR, cval | UART_LCR_DLAB); 25499196d8acSJiri Slaby 25509196d8acSJiri Slaby serial_dl_write(up, quot); 25519196d8acSJiri Slaby 25529196d8acSJiri Slaby /* 255345a7bd63SJoe Schultz * XR17V35x UARTs have an extra fractional divisor register (DLD) 255445a7bd63SJoe Schultz * 255545a7bd63SJoe Schultz * We need to recalculate all of the registers, because DLM and DLL 255645a7bd63SJoe Schultz * are already rounded to a whole integer. 255745a7bd63SJoe Schultz * 255845a7bd63SJoe Schultz * When recalculating we use a 32x clock instead of a 16x clock to 255945a7bd63SJoe Schultz * allow 1-bit for rounding in the fractional part. 256045a7bd63SJoe Schultz */ 256145a7bd63SJoe Schultz if (up->port.type == PORT_XR17V35X) { 256245a7bd63SJoe Schultz unsigned int baud_x32 = (port->uartclk * 2) / baud; 256345a7bd63SJoe Schultz u16 quot = baud_x32 / 32; 256445a7bd63SJoe Schultz u8 quot_frac = DIV_ROUND_CLOSEST(baud_x32 % 32, 2); 256545a7bd63SJoe Schultz 256645a7bd63SJoe Schultz serial_dl_write(up, quot); 256745a7bd63SJoe Schultz serial_port_out(port, 0x2, quot_frac & 0xf); 256845a7bd63SJoe Schultz } 256945a7bd63SJoe Schultz 257045a7bd63SJoe Schultz /* 25719196d8acSJiri Slaby * LCR DLAB must be set to enable 64-byte FIFO mode. If the FCR 25729196d8acSJiri Slaby * is written without DLAB set, this mode will be disabled. 25739196d8acSJiri Slaby */ 25749196d8acSJiri Slaby if (port->type == PORT_16750) 2575aef9a7bdSYoshihiro YUNOMAE serial_port_out(port, UART_FCR, up->fcr); 25769196d8acSJiri Slaby 25779196d8acSJiri Slaby serial_port_out(port, UART_LCR, cval); /* reset DLAB */ 25789196d8acSJiri Slaby up->lcr = cval; /* Save LCR */ 25799196d8acSJiri Slaby if (port->type != PORT_16750) { 25809196d8acSJiri Slaby /* emulated UARTs (Lucent Venus 167x) need two steps */ 2581aef9a7bdSYoshihiro YUNOMAE if (up->fcr & UART_FCR_ENABLE_FIFO) 25829196d8acSJiri Slaby serial_port_out(port, UART_FCR, UART_FCR_ENABLE_FIFO); 2583aef9a7bdSYoshihiro YUNOMAE serial_port_out(port, UART_FCR, up->fcr); /* set fcr */ 25849196d8acSJiri Slaby } 25859196d8acSJiri Slaby serial8250_set_mctrl(port, port->mctrl); 25869196d8acSJiri Slaby spin_unlock_irqrestore(&port->lock, flags); 2587d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_put(up); 2588d74d5d1bSSebastian Andrzej Siewior 25899196d8acSJiri Slaby /* Don't rewrite B0 */ 25909196d8acSJiri Slaby if (tty_termios_baud_rate(termios)) 25919196d8acSJiri Slaby tty_termios_encode_baud_rate(termios, baud, baud); 25929196d8acSJiri Slaby } 25939196d8acSJiri Slaby EXPORT_SYMBOL(serial8250_do_set_termios); 25949196d8acSJiri Slaby 25959196d8acSJiri Slaby static void 25969196d8acSJiri Slaby serial8250_set_termios(struct uart_port *port, struct ktermios *termios, 25979196d8acSJiri Slaby struct ktermios *old) 25989196d8acSJiri Slaby { 25999196d8acSJiri Slaby if (port->set_termios) 26009196d8acSJiri Slaby port->set_termios(port, termios, old); 26019196d8acSJiri Slaby else 26029196d8acSJiri Slaby serial8250_do_set_termios(port, termios, old); 26039196d8acSJiri Slaby } 26049196d8acSJiri Slaby 26059196d8acSJiri Slaby static void 26069196d8acSJiri Slaby serial8250_set_ldisc(struct uart_port *port, int new) 26079196d8acSJiri Slaby { 26089196d8acSJiri Slaby if (new == N_PPS) { 26099196d8acSJiri Slaby port->flags |= UPF_HARDPPS_CD; 26109196d8acSJiri Slaby serial8250_enable_ms(port); 26119196d8acSJiri Slaby } else 26129196d8acSJiri Slaby port->flags &= ~UPF_HARDPPS_CD; 26139196d8acSJiri Slaby } 26149196d8acSJiri Slaby 26159196d8acSJiri Slaby 26169196d8acSJiri Slaby void serial8250_do_pm(struct uart_port *port, unsigned int state, 26179196d8acSJiri Slaby unsigned int oldstate) 26189196d8acSJiri Slaby { 2619b1261c86SAndy Shevchenko struct uart_8250_port *p = up_to_u8250p(port); 26209196d8acSJiri Slaby 26219196d8acSJiri Slaby serial8250_set_sleep(p, state != 0); 26229196d8acSJiri Slaby } 26239196d8acSJiri Slaby EXPORT_SYMBOL(serial8250_do_pm); 26249196d8acSJiri Slaby 26259196d8acSJiri Slaby static void 26269196d8acSJiri Slaby serial8250_pm(struct uart_port *port, unsigned int state, 26279196d8acSJiri Slaby unsigned int oldstate) 26289196d8acSJiri Slaby { 26299196d8acSJiri Slaby if (port->pm) 26309196d8acSJiri Slaby port->pm(port, state, oldstate); 26319196d8acSJiri Slaby else 26329196d8acSJiri Slaby serial8250_do_pm(port, state, oldstate); 26339196d8acSJiri Slaby } 26349196d8acSJiri Slaby 26359196d8acSJiri Slaby static unsigned int serial8250_port_size(struct uart_8250_port *pt) 26369196d8acSJiri Slaby { 26379196d8acSJiri Slaby if (pt->port.iotype == UPIO_AU) 26389196d8acSJiri Slaby return 0x1000; 26399196d8acSJiri Slaby if (is_omap1_8250(pt)) 26409196d8acSJiri Slaby return 0x16 << pt->port.regshift; 26419196d8acSJiri Slaby 26429196d8acSJiri Slaby return 8 << pt->port.regshift; 26439196d8acSJiri Slaby } 26449196d8acSJiri Slaby 26459196d8acSJiri Slaby /* 26469196d8acSJiri Slaby * Resource handling. 26479196d8acSJiri Slaby */ 26489196d8acSJiri Slaby static int serial8250_request_std_resource(struct uart_8250_port *up) 26499196d8acSJiri Slaby { 26509196d8acSJiri Slaby unsigned int size = serial8250_port_size(up); 26519196d8acSJiri Slaby struct uart_port *port = &up->port; 26529196d8acSJiri Slaby int ret = 0; 26539196d8acSJiri Slaby 26549196d8acSJiri Slaby switch (port->iotype) { 26559196d8acSJiri Slaby case UPIO_AU: 26569196d8acSJiri Slaby case UPIO_TSI: 26579196d8acSJiri Slaby case UPIO_MEM32: 26589196d8acSJiri Slaby case UPIO_MEM: 26599196d8acSJiri Slaby if (!port->mapbase) 26609196d8acSJiri Slaby break; 26619196d8acSJiri Slaby 26629196d8acSJiri Slaby if (!request_mem_region(port->mapbase, size, "serial")) { 26639196d8acSJiri Slaby ret = -EBUSY; 26649196d8acSJiri Slaby break; 26659196d8acSJiri Slaby } 26669196d8acSJiri Slaby 26679196d8acSJiri Slaby if (port->flags & UPF_IOREMAP) { 26689196d8acSJiri Slaby port->membase = ioremap_nocache(port->mapbase, size); 26699196d8acSJiri Slaby if (!port->membase) { 26709196d8acSJiri Slaby release_mem_region(port->mapbase, size); 26719196d8acSJiri Slaby ret = -ENOMEM; 26729196d8acSJiri Slaby } 26739196d8acSJiri Slaby } 26749196d8acSJiri Slaby break; 26759196d8acSJiri Slaby 26769196d8acSJiri Slaby case UPIO_HUB6: 26779196d8acSJiri Slaby case UPIO_PORT: 26789196d8acSJiri Slaby if (!request_region(port->iobase, size, "serial")) 26799196d8acSJiri Slaby ret = -EBUSY; 26809196d8acSJiri Slaby break; 26819196d8acSJiri Slaby } 26829196d8acSJiri Slaby return ret; 26839196d8acSJiri Slaby } 26849196d8acSJiri Slaby 26859196d8acSJiri Slaby static void serial8250_release_std_resource(struct uart_8250_port *up) 26869196d8acSJiri Slaby { 26879196d8acSJiri Slaby unsigned int size = serial8250_port_size(up); 26889196d8acSJiri Slaby struct uart_port *port = &up->port; 26899196d8acSJiri Slaby 26909196d8acSJiri Slaby switch (port->iotype) { 26919196d8acSJiri Slaby case UPIO_AU: 26929196d8acSJiri Slaby case UPIO_TSI: 26939196d8acSJiri Slaby case UPIO_MEM32: 26949196d8acSJiri Slaby case UPIO_MEM: 26959196d8acSJiri Slaby if (!port->mapbase) 26969196d8acSJiri Slaby break; 26979196d8acSJiri Slaby 26989196d8acSJiri Slaby if (port->flags & UPF_IOREMAP) { 26999196d8acSJiri Slaby iounmap(port->membase); 27009196d8acSJiri Slaby port->membase = NULL; 27019196d8acSJiri Slaby } 27029196d8acSJiri Slaby 27039196d8acSJiri Slaby release_mem_region(port->mapbase, size); 27049196d8acSJiri Slaby break; 27059196d8acSJiri Slaby 27069196d8acSJiri Slaby case UPIO_HUB6: 27079196d8acSJiri Slaby case UPIO_PORT: 27089196d8acSJiri Slaby release_region(port->iobase, size); 27099196d8acSJiri Slaby break; 27109196d8acSJiri Slaby } 27119196d8acSJiri Slaby } 27129196d8acSJiri Slaby 27139196d8acSJiri Slaby static int serial8250_request_rsa_resource(struct uart_8250_port *up) 27149196d8acSJiri Slaby { 27159196d8acSJiri Slaby unsigned long start = UART_RSA_BASE << up->port.regshift; 27169196d8acSJiri Slaby unsigned int size = 8 << up->port.regshift; 27179196d8acSJiri Slaby struct uart_port *port = &up->port; 27189196d8acSJiri Slaby int ret = -EINVAL; 27199196d8acSJiri Slaby 27209196d8acSJiri Slaby switch (port->iotype) { 27219196d8acSJiri Slaby case UPIO_HUB6: 27229196d8acSJiri Slaby case UPIO_PORT: 27239196d8acSJiri Slaby start += port->iobase; 27249196d8acSJiri Slaby if (request_region(start, size, "serial-rsa")) 27259196d8acSJiri Slaby ret = 0; 27269196d8acSJiri Slaby else 27279196d8acSJiri Slaby ret = -EBUSY; 27289196d8acSJiri Slaby break; 27299196d8acSJiri Slaby } 27309196d8acSJiri Slaby 27319196d8acSJiri Slaby return ret; 27329196d8acSJiri Slaby } 27339196d8acSJiri Slaby 27349196d8acSJiri Slaby static void serial8250_release_rsa_resource(struct uart_8250_port *up) 27359196d8acSJiri Slaby { 27369196d8acSJiri Slaby unsigned long offset = UART_RSA_BASE << up->port.regshift; 27379196d8acSJiri Slaby unsigned int size = 8 << up->port.regshift; 27389196d8acSJiri Slaby struct uart_port *port = &up->port; 27399196d8acSJiri Slaby 27409196d8acSJiri Slaby switch (port->iotype) { 27419196d8acSJiri Slaby case UPIO_HUB6: 27429196d8acSJiri Slaby case UPIO_PORT: 27439196d8acSJiri Slaby release_region(port->iobase + offset, size); 27449196d8acSJiri Slaby break; 27459196d8acSJiri Slaby } 27469196d8acSJiri Slaby } 27479196d8acSJiri Slaby 27489196d8acSJiri Slaby static void serial8250_release_port(struct uart_port *port) 27499196d8acSJiri Slaby { 2750b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 27519196d8acSJiri Slaby 27529196d8acSJiri Slaby serial8250_release_std_resource(up); 27539196d8acSJiri Slaby if (port->type == PORT_RSA) 27549196d8acSJiri Slaby serial8250_release_rsa_resource(up); 27559196d8acSJiri Slaby } 27569196d8acSJiri Slaby 27579196d8acSJiri Slaby static int serial8250_request_port(struct uart_port *port) 27589196d8acSJiri Slaby { 2759b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 27609196d8acSJiri Slaby int ret; 27619196d8acSJiri Slaby 27629196d8acSJiri Slaby if (port->type == PORT_8250_CIR) 27639196d8acSJiri Slaby return -ENODEV; 27649196d8acSJiri Slaby 27659196d8acSJiri Slaby ret = serial8250_request_std_resource(up); 27669196d8acSJiri Slaby if (ret == 0 && port->type == PORT_RSA) { 27679196d8acSJiri Slaby ret = serial8250_request_rsa_resource(up); 27689196d8acSJiri Slaby if (ret < 0) 27699196d8acSJiri Slaby serial8250_release_std_resource(up); 27709196d8acSJiri Slaby } 27719196d8acSJiri Slaby 27729196d8acSJiri Slaby return ret; 27739196d8acSJiri Slaby } 27749196d8acSJiri Slaby 2775aef9a7bdSYoshihiro YUNOMAE static int fcr_get_rxtrig_bytes(struct uart_8250_port *up) 2776aef9a7bdSYoshihiro YUNOMAE { 2777aef9a7bdSYoshihiro YUNOMAE const struct serial8250_config *conf_type = &uart_config[up->port.type]; 2778aef9a7bdSYoshihiro YUNOMAE unsigned char bytes; 2779aef9a7bdSYoshihiro YUNOMAE 2780aef9a7bdSYoshihiro YUNOMAE bytes = conf_type->rxtrig_bytes[UART_FCR_R_TRIG_BITS(up->fcr)]; 2781aef9a7bdSYoshihiro YUNOMAE 2782aef9a7bdSYoshihiro YUNOMAE return bytes ? bytes : -EOPNOTSUPP; 2783aef9a7bdSYoshihiro YUNOMAE } 2784aef9a7bdSYoshihiro YUNOMAE 2785aef9a7bdSYoshihiro YUNOMAE static int bytes_to_fcr_rxtrig(struct uart_8250_port *up, unsigned char bytes) 2786aef9a7bdSYoshihiro YUNOMAE { 2787aef9a7bdSYoshihiro YUNOMAE const struct serial8250_config *conf_type = &uart_config[up->port.type]; 2788aef9a7bdSYoshihiro YUNOMAE int i; 2789aef9a7bdSYoshihiro YUNOMAE 2790aef9a7bdSYoshihiro YUNOMAE if (!conf_type->rxtrig_bytes[UART_FCR_R_TRIG_BITS(UART_FCR_R_TRIG_00)]) 2791aef9a7bdSYoshihiro YUNOMAE return -EOPNOTSUPP; 2792aef9a7bdSYoshihiro YUNOMAE 2793aef9a7bdSYoshihiro YUNOMAE for (i = 1; i < UART_FCR_R_TRIG_MAX_STATE; i++) { 2794aef9a7bdSYoshihiro YUNOMAE if (bytes < conf_type->rxtrig_bytes[i]) 2795aef9a7bdSYoshihiro YUNOMAE /* Use the nearest lower value */ 2796aef9a7bdSYoshihiro YUNOMAE return (--i) << UART_FCR_R_TRIG_SHIFT; 2797aef9a7bdSYoshihiro YUNOMAE } 2798aef9a7bdSYoshihiro YUNOMAE 2799aef9a7bdSYoshihiro YUNOMAE return UART_FCR_R_TRIG_11; 2800aef9a7bdSYoshihiro YUNOMAE } 2801aef9a7bdSYoshihiro YUNOMAE 2802aef9a7bdSYoshihiro YUNOMAE static int do_get_rxtrig(struct tty_port *port) 2803aef9a7bdSYoshihiro YUNOMAE { 2804aef9a7bdSYoshihiro YUNOMAE struct uart_state *state = container_of(port, struct uart_state, port); 2805aef9a7bdSYoshihiro YUNOMAE struct uart_port *uport = state->uart_port; 2806aef9a7bdSYoshihiro YUNOMAE struct uart_8250_port *up = 2807aef9a7bdSYoshihiro YUNOMAE container_of(uport, struct uart_8250_port, port); 2808aef9a7bdSYoshihiro YUNOMAE 2809aef9a7bdSYoshihiro YUNOMAE if (!(up->capabilities & UART_CAP_FIFO) || uport->fifosize <= 1) 2810aef9a7bdSYoshihiro YUNOMAE return -EINVAL; 2811aef9a7bdSYoshihiro YUNOMAE 2812aef9a7bdSYoshihiro YUNOMAE return fcr_get_rxtrig_bytes(up); 2813aef9a7bdSYoshihiro YUNOMAE } 2814aef9a7bdSYoshihiro YUNOMAE 2815aef9a7bdSYoshihiro YUNOMAE static int do_serial8250_get_rxtrig(struct tty_port *port) 2816aef9a7bdSYoshihiro YUNOMAE { 2817aef9a7bdSYoshihiro YUNOMAE int rxtrig_bytes; 2818aef9a7bdSYoshihiro YUNOMAE 2819aef9a7bdSYoshihiro YUNOMAE mutex_lock(&port->mutex); 2820aef9a7bdSYoshihiro YUNOMAE rxtrig_bytes = do_get_rxtrig(port); 2821aef9a7bdSYoshihiro YUNOMAE mutex_unlock(&port->mutex); 2822aef9a7bdSYoshihiro YUNOMAE 2823aef9a7bdSYoshihiro YUNOMAE return rxtrig_bytes; 2824aef9a7bdSYoshihiro YUNOMAE } 2825aef9a7bdSYoshihiro YUNOMAE 2826aef9a7bdSYoshihiro YUNOMAE static ssize_t serial8250_get_attr_rx_trig_bytes(struct device *dev, 2827aef9a7bdSYoshihiro YUNOMAE struct device_attribute *attr, char *buf) 2828aef9a7bdSYoshihiro YUNOMAE { 2829aef9a7bdSYoshihiro YUNOMAE struct tty_port *port = dev_get_drvdata(dev); 2830aef9a7bdSYoshihiro YUNOMAE int rxtrig_bytes; 2831aef9a7bdSYoshihiro YUNOMAE 2832aef9a7bdSYoshihiro YUNOMAE rxtrig_bytes = do_serial8250_get_rxtrig(port); 2833aef9a7bdSYoshihiro YUNOMAE if (rxtrig_bytes < 0) 2834aef9a7bdSYoshihiro YUNOMAE return rxtrig_bytes; 2835aef9a7bdSYoshihiro YUNOMAE 2836aef9a7bdSYoshihiro YUNOMAE return snprintf(buf, PAGE_SIZE, "%d\n", rxtrig_bytes); 2837aef9a7bdSYoshihiro YUNOMAE } 2838aef9a7bdSYoshihiro YUNOMAE 2839aef9a7bdSYoshihiro YUNOMAE static int do_set_rxtrig(struct tty_port *port, unsigned char bytes) 2840aef9a7bdSYoshihiro YUNOMAE { 2841aef9a7bdSYoshihiro YUNOMAE struct uart_state *state = container_of(port, struct uart_state, port); 2842aef9a7bdSYoshihiro YUNOMAE struct uart_port *uport = state->uart_port; 2843aef9a7bdSYoshihiro YUNOMAE struct uart_8250_port *up = 2844aef9a7bdSYoshihiro YUNOMAE container_of(uport, struct uart_8250_port, port); 2845aef9a7bdSYoshihiro YUNOMAE int rxtrig; 2846aef9a7bdSYoshihiro YUNOMAE 2847aef9a7bdSYoshihiro YUNOMAE if (!(up->capabilities & UART_CAP_FIFO) || uport->fifosize <= 1 || 2848aef9a7bdSYoshihiro YUNOMAE up->fifo_bug) 2849aef9a7bdSYoshihiro YUNOMAE return -EINVAL; 2850aef9a7bdSYoshihiro YUNOMAE 2851aef9a7bdSYoshihiro YUNOMAE rxtrig = bytes_to_fcr_rxtrig(up, bytes); 2852aef9a7bdSYoshihiro YUNOMAE if (rxtrig < 0) 2853aef9a7bdSYoshihiro YUNOMAE return rxtrig; 2854aef9a7bdSYoshihiro YUNOMAE 2855aef9a7bdSYoshihiro YUNOMAE serial8250_clear_fifos(up); 2856aef9a7bdSYoshihiro YUNOMAE up->fcr &= ~UART_FCR_TRIGGER_MASK; 2857aef9a7bdSYoshihiro YUNOMAE up->fcr |= (unsigned char)rxtrig; 2858aef9a7bdSYoshihiro YUNOMAE serial_out(up, UART_FCR, up->fcr); 2859aef9a7bdSYoshihiro YUNOMAE return 0; 2860aef9a7bdSYoshihiro YUNOMAE } 2861aef9a7bdSYoshihiro YUNOMAE 2862aef9a7bdSYoshihiro YUNOMAE static int do_serial8250_set_rxtrig(struct tty_port *port, unsigned char bytes) 2863aef9a7bdSYoshihiro YUNOMAE { 2864aef9a7bdSYoshihiro YUNOMAE int ret; 2865aef9a7bdSYoshihiro YUNOMAE 2866aef9a7bdSYoshihiro YUNOMAE mutex_lock(&port->mutex); 2867aef9a7bdSYoshihiro YUNOMAE ret = do_set_rxtrig(port, bytes); 2868aef9a7bdSYoshihiro YUNOMAE mutex_unlock(&port->mutex); 2869aef9a7bdSYoshihiro YUNOMAE 2870aef9a7bdSYoshihiro YUNOMAE return ret; 2871aef9a7bdSYoshihiro YUNOMAE } 2872aef9a7bdSYoshihiro YUNOMAE 2873aef9a7bdSYoshihiro YUNOMAE static ssize_t serial8250_set_attr_rx_trig_bytes(struct device *dev, 2874aef9a7bdSYoshihiro YUNOMAE struct device_attribute *attr, const char *buf, size_t count) 2875aef9a7bdSYoshihiro YUNOMAE { 2876aef9a7bdSYoshihiro YUNOMAE struct tty_port *port = dev_get_drvdata(dev); 2877aef9a7bdSYoshihiro YUNOMAE unsigned char bytes; 2878aef9a7bdSYoshihiro YUNOMAE int ret; 2879aef9a7bdSYoshihiro YUNOMAE 2880aef9a7bdSYoshihiro YUNOMAE if (!count) 2881aef9a7bdSYoshihiro YUNOMAE return -EINVAL; 2882aef9a7bdSYoshihiro YUNOMAE 2883aef9a7bdSYoshihiro YUNOMAE ret = kstrtou8(buf, 10, &bytes); 2884aef9a7bdSYoshihiro YUNOMAE if (ret < 0) 2885aef9a7bdSYoshihiro YUNOMAE return ret; 2886aef9a7bdSYoshihiro YUNOMAE 2887aef9a7bdSYoshihiro YUNOMAE ret = do_serial8250_set_rxtrig(port, bytes); 2888aef9a7bdSYoshihiro YUNOMAE if (ret < 0) 2889aef9a7bdSYoshihiro YUNOMAE return ret; 2890aef9a7bdSYoshihiro YUNOMAE 2891aef9a7bdSYoshihiro YUNOMAE return count; 2892aef9a7bdSYoshihiro YUNOMAE } 2893aef9a7bdSYoshihiro YUNOMAE 2894aef9a7bdSYoshihiro YUNOMAE static DEVICE_ATTR(rx_trig_bytes, S_IRUSR | S_IWUSR | S_IRGRP, 2895aef9a7bdSYoshihiro YUNOMAE serial8250_get_attr_rx_trig_bytes, 2896aef9a7bdSYoshihiro YUNOMAE serial8250_set_attr_rx_trig_bytes); 2897aef9a7bdSYoshihiro YUNOMAE 2898aef9a7bdSYoshihiro YUNOMAE static struct attribute *serial8250_dev_attrs[] = { 2899aef9a7bdSYoshihiro YUNOMAE &dev_attr_rx_trig_bytes.attr, 2900aef9a7bdSYoshihiro YUNOMAE NULL, 2901aef9a7bdSYoshihiro YUNOMAE }; 2902aef9a7bdSYoshihiro YUNOMAE 2903aef9a7bdSYoshihiro YUNOMAE static struct attribute_group serial8250_dev_attr_group = { 2904aef9a7bdSYoshihiro YUNOMAE .attrs = serial8250_dev_attrs, 2905aef9a7bdSYoshihiro YUNOMAE }; 2906aef9a7bdSYoshihiro YUNOMAE 2907aef9a7bdSYoshihiro YUNOMAE static void register_dev_spec_attr_grp(struct uart_8250_port *up) 2908aef9a7bdSYoshihiro YUNOMAE { 2909aef9a7bdSYoshihiro YUNOMAE const struct serial8250_config *conf_type = &uart_config[up->port.type]; 2910aef9a7bdSYoshihiro YUNOMAE 2911aef9a7bdSYoshihiro YUNOMAE if (conf_type->rxtrig_bytes[0]) 2912aef9a7bdSYoshihiro YUNOMAE up->port.attr_group = &serial8250_dev_attr_group; 2913aef9a7bdSYoshihiro YUNOMAE } 2914aef9a7bdSYoshihiro YUNOMAE 29159196d8acSJiri Slaby static void serial8250_config_port(struct uart_port *port, int flags) 29169196d8acSJiri Slaby { 2917b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 29189196d8acSJiri Slaby int probeflags = PROBE_ANY; 29199196d8acSJiri Slaby int ret; 29209196d8acSJiri Slaby 29219196d8acSJiri Slaby if (port->type == PORT_8250_CIR) 29229196d8acSJiri Slaby return; 29239196d8acSJiri Slaby 29249196d8acSJiri Slaby /* 29259196d8acSJiri Slaby * Find the region that we can probe for. This in turn 29269196d8acSJiri Slaby * tells us whether we can probe for the type of port. 29279196d8acSJiri Slaby */ 29289196d8acSJiri Slaby ret = serial8250_request_std_resource(up); 29299196d8acSJiri Slaby if (ret < 0) 29309196d8acSJiri Slaby return; 29319196d8acSJiri Slaby 29329196d8acSJiri Slaby ret = serial8250_request_rsa_resource(up); 29339196d8acSJiri Slaby if (ret < 0) 29349196d8acSJiri Slaby probeflags &= ~PROBE_RSA; 29359196d8acSJiri Slaby 29369196d8acSJiri Slaby if (port->iotype != up->cur_iotype) 29379196d8acSJiri Slaby set_io_from_upio(port); 29389196d8acSJiri Slaby 29399196d8acSJiri Slaby if (flags & UART_CONFIG_TYPE) 29409196d8acSJiri Slaby autoconfig(up, probeflags); 29419196d8acSJiri Slaby 29429196d8acSJiri Slaby /* if access method is AU, it is a 16550 with a quirk */ 29439196d8acSJiri Slaby if (port->type == PORT_16550A && port->iotype == UPIO_AU) 29449196d8acSJiri Slaby up->bugs |= UART_BUG_NOMSR; 29459196d8acSJiri Slaby 29463685f19eSStephen Warren /* HW bugs may trigger IRQ while IIR == NO_INT */ 29473685f19eSStephen Warren if (port->type == PORT_TEGRA) 29483685f19eSStephen Warren up->bugs |= UART_BUG_NOMSR; 29493685f19eSStephen Warren 29509196d8acSJiri Slaby if (port->type != PORT_UNKNOWN && flags & UART_CONFIG_IRQ) 29519196d8acSJiri Slaby autoconfig_irq(up); 29529196d8acSJiri Slaby 29539196d8acSJiri Slaby if (port->type != PORT_RSA && probeflags & PROBE_RSA) 29549196d8acSJiri Slaby serial8250_release_rsa_resource(up); 29559196d8acSJiri Slaby if (port->type == PORT_UNKNOWN) 29569196d8acSJiri Slaby serial8250_release_std_resource(up); 29579196d8acSJiri Slaby 29589196d8acSJiri Slaby /* Fixme: probably not the best place for this */ 29599196d8acSJiri Slaby if ((port->type == PORT_XR17V35X) || 29609196d8acSJiri Slaby (port->type == PORT_XR17D15X)) 29619196d8acSJiri Slaby port->handle_irq = exar_handle_irq; 2962aef9a7bdSYoshihiro YUNOMAE 2963aef9a7bdSYoshihiro YUNOMAE register_dev_spec_attr_grp(up); 2964aef9a7bdSYoshihiro YUNOMAE up->fcr = uart_config[up->port.type].fcr; 29659196d8acSJiri Slaby } 29669196d8acSJiri Slaby 29679196d8acSJiri Slaby static int 29689196d8acSJiri Slaby serial8250_verify_port(struct uart_port *port, struct serial_struct *ser) 29699196d8acSJiri Slaby { 29709196d8acSJiri Slaby if (ser->irq >= nr_irqs || ser->irq < 0 || 29719196d8acSJiri Slaby ser->baud_base < 9600 || ser->type < PORT_UNKNOWN || 29729196d8acSJiri Slaby ser->type >= ARRAY_SIZE(uart_config) || ser->type == PORT_CIRRUS || 29739196d8acSJiri Slaby ser->type == PORT_STARTECH) 29749196d8acSJiri Slaby return -EINVAL; 29759196d8acSJiri Slaby return 0; 29769196d8acSJiri Slaby } 29779196d8acSJiri Slaby 2978e676253bSRicardo Ribalda Delgado static int serial8250_ioctl(struct uart_port *port, unsigned int cmd, 2979e676253bSRicardo Ribalda Delgado unsigned long arg) 2980e676253bSRicardo Ribalda Delgado { 2981e676253bSRicardo Ribalda Delgado struct uart_8250_port *up = 2982e676253bSRicardo Ribalda Delgado container_of(port, struct uart_8250_port, port); 2983e676253bSRicardo Ribalda Delgado int ret; 2984e676253bSRicardo Ribalda Delgado struct serial_rs485 rs485_config; 2985e676253bSRicardo Ribalda Delgado 2986e676253bSRicardo Ribalda Delgado if (!up->rs485_config) 2987e676253bSRicardo Ribalda Delgado return -ENOIOCTLCMD; 2988e676253bSRicardo Ribalda Delgado 2989e676253bSRicardo Ribalda Delgado switch (cmd) { 2990e676253bSRicardo Ribalda Delgado case TIOCSRS485: 2991e676253bSRicardo Ribalda Delgado if (copy_from_user(&rs485_config, (void __user *)arg, 2992e676253bSRicardo Ribalda Delgado sizeof(rs485_config))) 2993e676253bSRicardo Ribalda Delgado return -EFAULT; 2994e676253bSRicardo Ribalda Delgado 2995e676253bSRicardo Ribalda Delgado ret = up->rs485_config(up, &rs485_config); 2996e676253bSRicardo Ribalda Delgado if (ret) 2997e676253bSRicardo Ribalda Delgado return ret; 2998e676253bSRicardo Ribalda Delgado 2999e676253bSRicardo Ribalda Delgado memcpy(&up->rs485, &rs485_config, sizeof(rs485_config)); 3000e676253bSRicardo Ribalda Delgado 3001e676253bSRicardo Ribalda Delgado return 0; 3002e676253bSRicardo Ribalda Delgado case TIOCGRS485: 3003e676253bSRicardo Ribalda Delgado if (copy_to_user((void __user *)arg, &up->rs485, 3004e676253bSRicardo Ribalda Delgado sizeof(up->rs485))) 3005e676253bSRicardo Ribalda Delgado return -EFAULT; 3006e676253bSRicardo Ribalda Delgado return 0; 3007e676253bSRicardo Ribalda Delgado default: 3008e676253bSRicardo Ribalda Delgado break; 3009e676253bSRicardo Ribalda Delgado } 3010e676253bSRicardo Ribalda Delgado 3011e676253bSRicardo Ribalda Delgado return -ENOIOCTLCMD; 3012e676253bSRicardo Ribalda Delgado } 3013e676253bSRicardo Ribalda Delgado 30149196d8acSJiri Slaby static const char * 30159196d8acSJiri Slaby serial8250_type(struct uart_port *port) 30169196d8acSJiri Slaby { 30179196d8acSJiri Slaby int type = port->type; 30189196d8acSJiri Slaby 30199196d8acSJiri Slaby if (type >= ARRAY_SIZE(uart_config)) 30209196d8acSJiri Slaby type = 0; 30219196d8acSJiri Slaby return uart_config[type].name; 30229196d8acSJiri Slaby } 30239196d8acSJiri Slaby 30249196d8acSJiri Slaby static struct uart_ops serial8250_pops = { 30259196d8acSJiri Slaby .tx_empty = serial8250_tx_empty, 30269196d8acSJiri Slaby .set_mctrl = serial8250_set_mctrl, 30279196d8acSJiri Slaby .get_mctrl = serial8250_get_mctrl, 30289196d8acSJiri Slaby .stop_tx = serial8250_stop_tx, 30299196d8acSJiri Slaby .start_tx = serial8250_start_tx, 3030234abab1SSebastian Andrzej Siewior .throttle = serial8250_throttle, 3031234abab1SSebastian Andrzej Siewior .unthrottle = serial8250_unthrottle, 30329196d8acSJiri Slaby .stop_rx = serial8250_stop_rx, 30339196d8acSJiri Slaby .enable_ms = serial8250_enable_ms, 30349196d8acSJiri Slaby .break_ctl = serial8250_break_ctl, 30359196d8acSJiri Slaby .startup = serial8250_startup, 30369196d8acSJiri Slaby .shutdown = serial8250_shutdown, 30379196d8acSJiri Slaby .set_termios = serial8250_set_termios, 30389196d8acSJiri Slaby .set_ldisc = serial8250_set_ldisc, 30399196d8acSJiri Slaby .pm = serial8250_pm, 30409196d8acSJiri Slaby .type = serial8250_type, 30419196d8acSJiri Slaby .release_port = serial8250_release_port, 30429196d8acSJiri Slaby .request_port = serial8250_request_port, 30439196d8acSJiri Slaby .config_port = serial8250_config_port, 30449196d8acSJiri Slaby .verify_port = serial8250_verify_port, 3045e676253bSRicardo Ribalda Delgado .ioctl = serial8250_ioctl, 30469196d8acSJiri Slaby #ifdef CONFIG_CONSOLE_POLL 30479196d8acSJiri Slaby .poll_get_char = serial8250_get_poll_char, 30489196d8acSJiri Slaby .poll_put_char = serial8250_put_poll_char, 30499196d8acSJiri Slaby #endif 30509196d8acSJiri Slaby }; 30519196d8acSJiri Slaby 30529196d8acSJiri Slaby static struct uart_8250_port serial8250_ports[UART_NR]; 30539196d8acSJiri Slaby 3054ae14a795SSebastian Andrzej Siewior /** 3055ae14a795SSebastian Andrzej Siewior * serial8250_get_port - retrieve struct uart_8250_port 3056ae14a795SSebastian Andrzej Siewior * @line: serial line number 3057ae14a795SSebastian Andrzej Siewior * 3058ae14a795SSebastian Andrzej Siewior * This function retrieves struct uart_8250_port for the specific line. 3059ae14a795SSebastian Andrzej Siewior * This struct *must* *not* be used to perform a 8250 or serial core operation 3060ae14a795SSebastian Andrzej Siewior * which is not accessible otherwise. Its only purpose is to make the struct 3061ae14a795SSebastian Andrzej Siewior * accessible to the runtime-pm callbacks for context suspend/restore. 3062ae14a795SSebastian Andrzej Siewior * The lock assumption made here is none because runtime-pm suspend/resume 3063ae14a795SSebastian Andrzej Siewior * callbacks should not be invoked if there is any operation performed on the 3064ae14a795SSebastian Andrzej Siewior * port. 3065ae14a795SSebastian Andrzej Siewior */ 3066ae14a795SSebastian Andrzej Siewior struct uart_8250_port *serial8250_get_port(int line) 3067ae14a795SSebastian Andrzej Siewior { 3068ae14a795SSebastian Andrzej Siewior return &serial8250_ports[line]; 3069ae14a795SSebastian Andrzej Siewior } 3070ae14a795SSebastian Andrzej Siewior EXPORT_SYMBOL_GPL(serial8250_get_port); 3071ae14a795SSebastian Andrzej Siewior 30729196d8acSJiri Slaby static void (*serial8250_isa_config)(int port, struct uart_port *up, 30739196d8acSJiri Slaby unsigned short *capabilities); 30749196d8acSJiri Slaby 30759196d8acSJiri Slaby void serial8250_set_isa_configurator( 30769196d8acSJiri Slaby void (*v)(int port, struct uart_port *up, unsigned short *capabilities)) 30779196d8acSJiri Slaby { 30789196d8acSJiri Slaby serial8250_isa_config = v; 30799196d8acSJiri Slaby } 30809196d8acSJiri Slaby EXPORT_SYMBOL(serial8250_set_isa_configurator); 30819196d8acSJiri Slaby 30829196d8acSJiri Slaby static void __init serial8250_isa_init_ports(void) 30839196d8acSJiri Slaby { 30849196d8acSJiri Slaby struct uart_8250_port *up; 30859196d8acSJiri Slaby static int first = 1; 30869196d8acSJiri Slaby int i, irqflag = 0; 30879196d8acSJiri Slaby 30889196d8acSJiri Slaby if (!first) 30899196d8acSJiri Slaby return; 30909196d8acSJiri Slaby first = 0; 30919196d8acSJiri Slaby 30929196d8acSJiri Slaby if (nr_uarts > UART_NR) 30939196d8acSJiri Slaby nr_uarts = UART_NR; 30949196d8acSJiri Slaby 3095317a6842SKyle McMartin for (i = 0; i < nr_uarts; i++) { 30969196d8acSJiri Slaby struct uart_8250_port *up = &serial8250_ports[i]; 30979196d8acSJiri Slaby struct uart_port *port = &up->port; 30989196d8acSJiri Slaby 30999196d8acSJiri Slaby port->line = i; 31009196d8acSJiri Slaby spin_lock_init(&port->lock); 31019196d8acSJiri Slaby 31029196d8acSJiri Slaby init_timer(&up->timer); 31039196d8acSJiri Slaby up->timer.function = serial8250_timeout; 31049196d8acSJiri Slaby up->cur_iotype = 0xFF; 31059196d8acSJiri Slaby 31069196d8acSJiri Slaby /* 31079196d8acSJiri Slaby * ALPHA_KLUDGE_MCR needs to be killed. 31089196d8acSJiri Slaby */ 31099196d8acSJiri Slaby up->mcr_mask = ~ALPHA_KLUDGE_MCR; 31109196d8acSJiri Slaby up->mcr_force = ALPHA_KLUDGE_MCR; 31119196d8acSJiri Slaby 31129196d8acSJiri Slaby port->ops = &serial8250_pops; 31139196d8acSJiri Slaby } 31149196d8acSJiri Slaby 31159196d8acSJiri Slaby if (share_irqs) 31169196d8acSJiri Slaby irqflag = IRQF_SHARED; 31179196d8acSJiri Slaby 31189196d8acSJiri Slaby for (i = 0, up = serial8250_ports; 31199196d8acSJiri Slaby i < ARRAY_SIZE(old_serial_port) && i < nr_uarts; 31209196d8acSJiri Slaby i++, up++) { 31219196d8acSJiri Slaby struct uart_port *port = &up->port; 31229196d8acSJiri Slaby 31239196d8acSJiri Slaby port->iobase = old_serial_port[i].port; 31249196d8acSJiri Slaby port->irq = irq_canonicalize(old_serial_port[i].irq); 31259196d8acSJiri Slaby port->irqflags = old_serial_port[i].irqflags; 31269196d8acSJiri Slaby port->uartclk = old_serial_port[i].baud_base * 16; 31279196d8acSJiri Slaby port->flags = old_serial_port[i].flags; 31289196d8acSJiri Slaby port->hub6 = old_serial_port[i].hub6; 31299196d8acSJiri Slaby port->membase = old_serial_port[i].iomem_base; 31309196d8acSJiri Slaby port->iotype = old_serial_port[i].io_type; 31319196d8acSJiri Slaby port->regshift = old_serial_port[i].iomem_reg_shift; 31329196d8acSJiri Slaby set_io_from_upio(port); 31339196d8acSJiri Slaby port->irqflags |= irqflag; 31349196d8acSJiri Slaby if (serial8250_isa_config != NULL) 31359196d8acSJiri Slaby serial8250_isa_config(i, &up->port, &up->capabilities); 31369196d8acSJiri Slaby 31379196d8acSJiri Slaby } 31389196d8acSJiri Slaby } 31399196d8acSJiri Slaby 31409196d8acSJiri Slaby static void 31419196d8acSJiri Slaby serial8250_init_fixed_type_port(struct uart_8250_port *up, unsigned int type) 31429196d8acSJiri Slaby { 31439196d8acSJiri Slaby up->port.type = type; 31449196d8acSJiri Slaby if (!up->port.fifosize) 31459196d8acSJiri Slaby up->port.fifosize = uart_config[type].fifo_size; 31469196d8acSJiri Slaby if (!up->tx_loadsz) 31479196d8acSJiri Slaby up->tx_loadsz = uart_config[type].tx_loadsz; 31489196d8acSJiri Slaby if (!up->capabilities) 31499196d8acSJiri Slaby up->capabilities = uart_config[type].flags; 31509196d8acSJiri Slaby } 31519196d8acSJiri Slaby 31529196d8acSJiri Slaby static void __init 31539196d8acSJiri Slaby serial8250_register_ports(struct uart_driver *drv, struct device *dev) 31549196d8acSJiri Slaby { 31559196d8acSJiri Slaby int i; 31569196d8acSJiri Slaby 31579196d8acSJiri Slaby for (i = 0; i < nr_uarts; i++) { 31589196d8acSJiri Slaby struct uart_8250_port *up = &serial8250_ports[i]; 31599196d8acSJiri Slaby 31609196d8acSJiri Slaby if (up->port.dev) 31619196d8acSJiri Slaby continue; 31629196d8acSJiri Slaby 31639196d8acSJiri Slaby up->port.dev = dev; 31649196d8acSJiri Slaby 31659196d8acSJiri Slaby if (up->port.flags & UPF_FIXED_TYPE) 31669196d8acSJiri Slaby serial8250_init_fixed_type_port(up, up->port.type); 31679196d8acSJiri Slaby 31689196d8acSJiri Slaby uart_add_one_port(drv, &up->port); 31699196d8acSJiri Slaby } 31709196d8acSJiri Slaby } 31719196d8acSJiri Slaby 31729196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_CONSOLE 31739196d8acSJiri Slaby 31749196d8acSJiri Slaby static void serial8250_console_putchar(struct uart_port *port, int ch) 31759196d8acSJiri Slaby { 3176b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 31779196d8acSJiri Slaby 31789196d8acSJiri Slaby wait_for_xmitr(up, UART_LSR_THRE); 31799196d8acSJiri Slaby serial_port_out(port, UART_TX, ch); 31809196d8acSJiri Slaby } 31819196d8acSJiri Slaby 31829196d8acSJiri Slaby /* 31839196d8acSJiri Slaby * Print a string to the serial port trying not to disturb 31849196d8acSJiri Slaby * any possible real use of the port... 31859196d8acSJiri Slaby * 31869196d8acSJiri Slaby * The console_lock must be held when we get here. 31879196d8acSJiri Slaby */ 31889196d8acSJiri Slaby static void 31899196d8acSJiri Slaby serial8250_console_write(struct console *co, const char *s, unsigned int count) 31909196d8acSJiri Slaby { 31919196d8acSJiri Slaby struct uart_8250_port *up = &serial8250_ports[co->index]; 31929196d8acSJiri Slaby struct uart_port *port = &up->port; 31939196d8acSJiri Slaby unsigned long flags; 31949196d8acSJiri Slaby unsigned int ier; 31959196d8acSJiri Slaby int locked = 1; 31969196d8acSJiri Slaby 31979196d8acSJiri Slaby touch_nmi_watchdog(); 31989196d8acSJiri Slaby 3199d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_get(up); 3200d74d5d1bSSebastian Andrzej Siewior 3201ebade5e8SIngo Molnar if (port->sysrq || oops_in_progress) 3202ebade5e8SIngo Molnar locked = spin_trylock_irqsave(&port->lock, flags); 3203ebade5e8SIngo Molnar else 3204ebade5e8SIngo Molnar spin_lock_irqsave(&port->lock, flags); 32059196d8acSJiri Slaby 32069196d8acSJiri Slaby /* 32079196d8acSJiri Slaby * First save the IER then disable the interrupts 32089196d8acSJiri Slaby */ 32099196d8acSJiri Slaby ier = serial_port_in(port, UART_IER); 32109196d8acSJiri Slaby 32119196d8acSJiri Slaby if (up->capabilities & UART_CAP_UUE) 32129196d8acSJiri Slaby serial_port_out(port, UART_IER, UART_IER_UUE); 32139196d8acSJiri Slaby else 32149196d8acSJiri Slaby serial_port_out(port, UART_IER, 0); 32159196d8acSJiri Slaby 32169196d8acSJiri Slaby uart_console_write(port, s, count, serial8250_console_putchar); 32179196d8acSJiri Slaby 32189196d8acSJiri Slaby /* 32199196d8acSJiri Slaby * Finally, wait for transmitter to become empty 32209196d8acSJiri Slaby * and restore the IER 32219196d8acSJiri Slaby */ 32229196d8acSJiri Slaby wait_for_xmitr(up, BOTH_EMPTY); 32239196d8acSJiri Slaby serial_port_out(port, UART_IER, ier); 32249196d8acSJiri Slaby 32259196d8acSJiri Slaby /* 32269196d8acSJiri Slaby * The receive handling will happen properly because the 32279196d8acSJiri Slaby * receive ready bit will still be set; it is not cleared 32289196d8acSJiri Slaby * on read. However, modem control will not, we must 32299196d8acSJiri Slaby * call it if we have saved something in the saved flags 32309196d8acSJiri Slaby * while processing with interrupts off. 32319196d8acSJiri Slaby */ 32329196d8acSJiri Slaby if (up->msr_saved_flags) 32339196d8acSJiri Slaby serial8250_modem_status(up); 32349196d8acSJiri Slaby 32359196d8acSJiri Slaby if (locked) 3236ebade5e8SIngo Molnar spin_unlock_irqrestore(&port->lock, flags); 3237d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_put(up); 32389196d8acSJiri Slaby } 32399196d8acSJiri Slaby 32409196d8acSJiri Slaby static int __init serial8250_console_setup(struct console *co, char *options) 32419196d8acSJiri Slaby { 32429196d8acSJiri Slaby struct uart_port *port; 32439196d8acSJiri Slaby int baud = 9600; 32449196d8acSJiri Slaby int bits = 8; 32459196d8acSJiri Slaby int parity = 'n'; 32469196d8acSJiri Slaby int flow = 'n'; 32479196d8acSJiri Slaby 32489196d8acSJiri Slaby /* 32499196d8acSJiri Slaby * Check whether an invalid uart number has been specified, and 32509196d8acSJiri Slaby * if so, search for the first available port that does have 32519196d8acSJiri Slaby * console support. 32529196d8acSJiri Slaby */ 3253317a6842SKyle McMartin if (co->index >= nr_uarts) 32549196d8acSJiri Slaby co->index = 0; 32559196d8acSJiri Slaby port = &serial8250_ports[co->index].port; 32569196d8acSJiri Slaby if (!port->iobase && !port->membase) 32579196d8acSJiri Slaby return -ENODEV; 32589196d8acSJiri Slaby 32599196d8acSJiri Slaby if (options) 32609196d8acSJiri Slaby uart_parse_options(options, &baud, &parity, &bits, &flow); 32619196d8acSJiri Slaby 32629196d8acSJiri Slaby return uart_set_options(port, co, baud, parity, bits, flow); 32639196d8acSJiri Slaby } 32649196d8acSJiri Slaby 32659196d8acSJiri Slaby static int serial8250_console_early_setup(void) 32669196d8acSJiri Slaby { 32679196d8acSJiri Slaby return serial8250_find_port_for_earlycon(); 32689196d8acSJiri Slaby } 32699196d8acSJiri Slaby 32709196d8acSJiri Slaby static struct console serial8250_console = { 32719196d8acSJiri Slaby .name = "ttyS", 32729196d8acSJiri Slaby .write = serial8250_console_write, 32739196d8acSJiri Slaby .device = uart_console_device, 32749196d8acSJiri Slaby .setup = serial8250_console_setup, 32759196d8acSJiri Slaby .early_setup = serial8250_console_early_setup, 32769196d8acSJiri Slaby .flags = CON_PRINTBUFFER | CON_ANYTIME, 32779196d8acSJiri Slaby .index = -1, 32789196d8acSJiri Slaby .data = &serial8250_reg, 32799196d8acSJiri Slaby }; 32809196d8acSJiri Slaby 32819196d8acSJiri Slaby static int __init serial8250_console_init(void) 32829196d8acSJiri Slaby { 32839196d8acSJiri Slaby serial8250_isa_init_ports(); 32849196d8acSJiri Slaby register_console(&serial8250_console); 32859196d8acSJiri Slaby return 0; 32869196d8acSJiri Slaby } 32879196d8acSJiri Slaby console_initcall(serial8250_console_init); 32889196d8acSJiri Slaby 32899196d8acSJiri Slaby int serial8250_find_port(struct uart_port *p) 32909196d8acSJiri Slaby { 32919196d8acSJiri Slaby int line; 32929196d8acSJiri Slaby struct uart_port *port; 32939196d8acSJiri Slaby 3294317a6842SKyle McMartin for (line = 0; line < nr_uarts; line++) { 32959196d8acSJiri Slaby port = &serial8250_ports[line].port; 32969196d8acSJiri Slaby if (uart_match_port(p, port)) 32979196d8acSJiri Slaby return line; 32989196d8acSJiri Slaby } 32999196d8acSJiri Slaby return -ENODEV; 33009196d8acSJiri Slaby } 33019196d8acSJiri Slaby 33029196d8acSJiri Slaby #define SERIAL8250_CONSOLE &serial8250_console 33039196d8acSJiri Slaby #else 33049196d8acSJiri Slaby #define SERIAL8250_CONSOLE NULL 33059196d8acSJiri Slaby #endif 33069196d8acSJiri Slaby 33079196d8acSJiri Slaby static struct uart_driver serial8250_reg = { 33089196d8acSJiri Slaby .owner = THIS_MODULE, 33099196d8acSJiri Slaby .driver_name = "serial", 33109196d8acSJiri Slaby .dev_name = "ttyS", 33119196d8acSJiri Slaby .major = TTY_MAJOR, 33129196d8acSJiri Slaby .minor = 64, 33139196d8acSJiri Slaby .cons = SERIAL8250_CONSOLE, 33149196d8acSJiri Slaby }; 33159196d8acSJiri Slaby 33169196d8acSJiri Slaby /* 33179196d8acSJiri Slaby * early_serial_setup - early registration for 8250 ports 33189196d8acSJiri Slaby * 33199196d8acSJiri Slaby * Setup an 8250 port structure prior to console initialisation. Use 33209196d8acSJiri Slaby * after console initialisation will cause undefined behaviour. 33219196d8acSJiri Slaby */ 33229196d8acSJiri Slaby int __init early_serial_setup(struct uart_port *port) 33239196d8acSJiri Slaby { 33249196d8acSJiri Slaby struct uart_port *p; 33259196d8acSJiri Slaby 33269196d8acSJiri Slaby if (port->line >= ARRAY_SIZE(serial8250_ports)) 33279196d8acSJiri Slaby return -ENODEV; 33289196d8acSJiri Slaby 33299196d8acSJiri Slaby serial8250_isa_init_ports(); 33309196d8acSJiri Slaby p = &serial8250_ports[port->line].port; 33319196d8acSJiri Slaby p->iobase = port->iobase; 33329196d8acSJiri Slaby p->membase = port->membase; 33339196d8acSJiri Slaby p->irq = port->irq; 33349196d8acSJiri Slaby p->irqflags = port->irqflags; 33359196d8acSJiri Slaby p->uartclk = port->uartclk; 33369196d8acSJiri Slaby p->fifosize = port->fifosize; 33379196d8acSJiri Slaby p->regshift = port->regshift; 33389196d8acSJiri Slaby p->iotype = port->iotype; 33399196d8acSJiri Slaby p->flags = port->flags; 33409196d8acSJiri Slaby p->mapbase = port->mapbase; 33419196d8acSJiri Slaby p->private_data = port->private_data; 33429196d8acSJiri Slaby p->type = port->type; 33439196d8acSJiri Slaby p->line = port->line; 33449196d8acSJiri Slaby 33459196d8acSJiri Slaby set_io_from_upio(p); 33469196d8acSJiri Slaby if (port->serial_in) 33479196d8acSJiri Slaby p->serial_in = port->serial_in; 33489196d8acSJiri Slaby if (port->serial_out) 33499196d8acSJiri Slaby p->serial_out = port->serial_out; 33509196d8acSJiri Slaby if (port->handle_irq) 33519196d8acSJiri Slaby p->handle_irq = port->handle_irq; 33529196d8acSJiri Slaby else 33539196d8acSJiri Slaby p->handle_irq = serial8250_default_handle_irq; 33549196d8acSJiri Slaby 33559196d8acSJiri Slaby return 0; 33569196d8acSJiri Slaby } 33579196d8acSJiri Slaby 33589196d8acSJiri Slaby /** 33599196d8acSJiri Slaby * serial8250_suspend_port - suspend one serial port 33609196d8acSJiri Slaby * @line: serial line number 33619196d8acSJiri Slaby * 33629196d8acSJiri Slaby * Suspend one serial port. 33639196d8acSJiri Slaby */ 33649196d8acSJiri Slaby void serial8250_suspend_port(int line) 33659196d8acSJiri Slaby { 33669196d8acSJiri Slaby uart_suspend_port(&serial8250_reg, &serial8250_ports[line].port); 33679196d8acSJiri Slaby } 33689196d8acSJiri Slaby 33699196d8acSJiri Slaby /** 33709196d8acSJiri Slaby * serial8250_resume_port - resume one serial port 33719196d8acSJiri Slaby * @line: serial line number 33729196d8acSJiri Slaby * 33739196d8acSJiri Slaby * Resume one serial port. 33749196d8acSJiri Slaby */ 33759196d8acSJiri Slaby void serial8250_resume_port(int line) 33769196d8acSJiri Slaby { 33779196d8acSJiri Slaby struct uart_8250_port *up = &serial8250_ports[line]; 33789196d8acSJiri Slaby struct uart_port *port = &up->port; 33799196d8acSJiri Slaby 33809196d8acSJiri Slaby if (up->capabilities & UART_NATSEMI) { 33819196d8acSJiri Slaby /* Ensure it's still in high speed mode */ 33829196d8acSJiri Slaby serial_port_out(port, UART_LCR, 0xE0); 33839196d8acSJiri Slaby 33849196d8acSJiri Slaby ns16550a_goto_highspeed(up); 33859196d8acSJiri Slaby 33869196d8acSJiri Slaby serial_port_out(port, UART_LCR, 0); 33879196d8acSJiri Slaby port->uartclk = 921600*16; 33889196d8acSJiri Slaby } 33899196d8acSJiri Slaby uart_resume_port(&serial8250_reg, port); 33909196d8acSJiri Slaby } 33919196d8acSJiri Slaby 33929196d8acSJiri Slaby /* 33939196d8acSJiri Slaby * Register a set of serial devices attached to a platform device. The 33949196d8acSJiri Slaby * list is terminated with a zero flags entry, which means we expect 33959196d8acSJiri Slaby * all entries to have at least UPF_BOOT_AUTOCONF set. 33969196d8acSJiri Slaby */ 33979196d8acSJiri Slaby static int serial8250_probe(struct platform_device *dev) 33989196d8acSJiri Slaby { 3399574de559SJingoo Han struct plat_serial8250_port *p = dev_get_platdata(&dev->dev); 34009196d8acSJiri Slaby struct uart_8250_port uart; 34019196d8acSJiri Slaby int ret, i, irqflag = 0; 34029196d8acSJiri Slaby 34039196d8acSJiri Slaby memset(&uart, 0, sizeof(uart)); 34049196d8acSJiri Slaby 34059196d8acSJiri Slaby if (share_irqs) 34069196d8acSJiri Slaby irqflag = IRQF_SHARED; 34079196d8acSJiri Slaby 34089196d8acSJiri Slaby for (i = 0; p && p->flags != 0; p++, i++) { 34099196d8acSJiri Slaby uart.port.iobase = p->iobase; 34109196d8acSJiri Slaby uart.port.membase = p->membase; 34119196d8acSJiri Slaby uart.port.irq = p->irq; 34129196d8acSJiri Slaby uart.port.irqflags = p->irqflags; 34139196d8acSJiri Slaby uart.port.uartclk = p->uartclk; 34149196d8acSJiri Slaby uart.port.regshift = p->regshift; 34159196d8acSJiri Slaby uart.port.iotype = p->iotype; 34169196d8acSJiri Slaby uart.port.flags = p->flags; 34179196d8acSJiri Slaby uart.port.mapbase = p->mapbase; 34189196d8acSJiri Slaby uart.port.hub6 = p->hub6; 34199196d8acSJiri Slaby uart.port.private_data = p->private_data; 34209196d8acSJiri Slaby uart.port.type = p->type; 34219196d8acSJiri Slaby uart.port.serial_in = p->serial_in; 34229196d8acSJiri Slaby uart.port.serial_out = p->serial_out; 34239196d8acSJiri Slaby uart.port.handle_irq = p->handle_irq; 34249196d8acSJiri Slaby uart.port.handle_break = p->handle_break; 34259196d8acSJiri Slaby uart.port.set_termios = p->set_termios; 34269196d8acSJiri Slaby uart.port.pm = p->pm; 34279196d8acSJiri Slaby uart.port.dev = &dev->dev; 34289196d8acSJiri Slaby uart.port.irqflags |= irqflag; 34299196d8acSJiri Slaby ret = serial8250_register_8250_port(&uart); 34309196d8acSJiri Slaby if (ret < 0) { 34319196d8acSJiri Slaby dev_err(&dev->dev, "unable to register port at index %d " 34329196d8acSJiri Slaby "(IO%lx MEM%llx IRQ%d): %d\n", i, 34339196d8acSJiri Slaby p->iobase, (unsigned long long)p->mapbase, 34349196d8acSJiri Slaby p->irq, ret); 34359196d8acSJiri Slaby } 34369196d8acSJiri Slaby } 34379196d8acSJiri Slaby return 0; 34389196d8acSJiri Slaby } 34399196d8acSJiri Slaby 34409196d8acSJiri Slaby /* 34419196d8acSJiri Slaby * Remove serial ports registered against a platform device. 34429196d8acSJiri Slaby */ 34439196d8acSJiri Slaby static int serial8250_remove(struct platform_device *dev) 34449196d8acSJiri Slaby { 34459196d8acSJiri Slaby int i; 34469196d8acSJiri Slaby 3447317a6842SKyle McMartin for (i = 0; i < nr_uarts; i++) { 34489196d8acSJiri Slaby struct uart_8250_port *up = &serial8250_ports[i]; 34499196d8acSJiri Slaby 34509196d8acSJiri Slaby if (up->port.dev == &dev->dev) 34519196d8acSJiri Slaby serial8250_unregister_port(i); 34529196d8acSJiri Slaby } 34539196d8acSJiri Slaby return 0; 34549196d8acSJiri Slaby } 34559196d8acSJiri Slaby 34569196d8acSJiri Slaby static int serial8250_suspend(struct platform_device *dev, pm_message_t state) 34579196d8acSJiri Slaby { 34589196d8acSJiri Slaby int i; 34599196d8acSJiri Slaby 34609196d8acSJiri Slaby for (i = 0; i < UART_NR; i++) { 34619196d8acSJiri Slaby struct uart_8250_port *up = &serial8250_ports[i]; 34629196d8acSJiri Slaby 34639196d8acSJiri Slaby if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev) 34649196d8acSJiri Slaby uart_suspend_port(&serial8250_reg, &up->port); 34659196d8acSJiri Slaby } 34669196d8acSJiri Slaby 34679196d8acSJiri Slaby return 0; 34689196d8acSJiri Slaby } 34699196d8acSJiri Slaby 34709196d8acSJiri Slaby static int serial8250_resume(struct platform_device *dev) 34719196d8acSJiri Slaby { 34729196d8acSJiri Slaby int i; 34739196d8acSJiri Slaby 34749196d8acSJiri Slaby for (i = 0; i < UART_NR; i++) { 34759196d8acSJiri Slaby struct uart_8250_port *up = &serial8250_ports[i]; 34769196d8acSJiri Slaby 34779196d8acSJiri Slaby if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev) 34789196d8acSJiri Slaby serial8250_resume_port(i); 34799196d8acSJiri Slaby } 34809196d8acSJiri Slaby 34819196d8acSJiri Slaby return 0; 34829196d8acSJiri Slaby } 34839196d8acSJiri Slaby 34849196d8acSJiri Slaby static struct platform_driver serial8250_isa_driver = { 34859196d8acSJiri Slaby .probe = serial8250_probe, 34869196d8acSJiri Slaby .remove = serial8250_remove, 34879196d8acSJiri Slaby .suspend = serial8250_suspend, 34889196d8acSJiri Slaby .resume = serial8250_resume, 34899196d8acSJiri Slaby .driver = { 34909196d8acSJiri Slaby .name = "serial8250", 34919196d8acSJiri Slaby .owner = THIS_MODULE, 34929196d8acSJiri Slaby }, 34939196d8acSJiri Slaby }; 34949196d8acSJiri Slaby 34959196d8acSJiri Slaby /* 34969196d8acSJiri Slaby * This "device" covers _all_ ISA 8250-compatible serial devices listed 34979196d8acSJiri Slaby * in the table in include/asm/serial.h 34989196d8acSJiri Slaby */ 34999196d8acSJiri Slaby static struct platform_device *serial8250_isa_devs; 35009196d8acSJiri Slaby 35019196d8acSJiri Slaby /* 35029196d8acSJiri Slaby * serial8250_register_8250_port and serial8250_unregister_port allows for 35039196d8acSJiri Slaby * 16x50 serial ports to be configured at run-time, to support PCMCIA 35049196d8acSJiri Slaby * modems and PCI multiport cards. 35059196d8acSJiri Slaby */ 35069196d8acSJiri Slaby static DEFINE_MUTEX(serial_mutex); 35079196d8acSJiri Slaby 35089196d8acSJiri Slaby static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port *port) 35099196d8acSJiri Slaby { 35109196d8acSJiri Slaby int i; 35119196d8acSJiri Slaby 35129196d8acSJiri Slaby /* 35139196d8acSJiri Slaby * First, find a port entry which matches. 35149196d8acSJiri Slaby */ 3515317a6842SKyle McMartin for (i = 0; i < nr_uarts; i++) 35169196d8acSJiri Slaby if (uart_match_port(&serial8250_ports[i].port, port)) 35179196d8acSJiri Slaby return &serial8250_ports[i]; 35189196d8acSJiri Slaby 35199196d8acSJiri Slaby /* 35209196d8acSJiri Slaby * We didn't find a matching entry, so look for the first 35219196d8acSJiri Slaby * free entry. We look for one which hasn't been previously 35229196d8acSJiri Slaby * used (indicated by zero iobase). 35239196d8acSJiri Slaby */ 3524317a6842SKyle McMartin for (i = 0; i < nr_uarts; i++) 35259196d8acSJiri Slaby if (serial8250_ports[i].port.type == PORT_UNKNOWN && 35269196d8acSJiri Slaby serial8250_ports[i].port.iobase == 0) 35279196d8acSJiri Slaby return &serial8250_ports[i]; 35289196d8acSJiri Slaby 35299196d8acSJiri Slaby /* 35309196d8acSJiri Slaby * That also failed. Last resort is to find any entry which 35319196d8acSJiri Slaby * doesn't have a real port associated with it. 35329196d8acSJiri Slaby */ 3533317a6842SKyle McMartin for (i = 0; i < nr_uarts; i++) 35349196d8acSJiri Slaby if (serial8250_ports[i].port.type == PORT_UNKNOWN) 35359196d8acSJiri Slaby return &serial8250_ports[i]; 35369196d8acSJiri Slaby 35379196d8acSJiri Slaby return NULL; 35389196d8acSJiri Slaby } 35399196d8acSJiri Slaby 35409196d8acSJiri Slaby /** 35419196d8acSJiri Slaby * serial8250_register_8250_port - register a serial port 35429196d8acSJiri Slaby * @up: serial port template 35439196d8acSJiri Slaby * 35449196d8acSJiri Slaby * Configure the serial port specified by the request. If the 35459196d8acSJiri Slaby * port exists and is in use, it is hung up and unregistered 35469196d8acSJiri Slaby * first. 35479196d8acSJiri Slaby * 35489196d8acSJiri Slaby * The port is then probed and if necessary the IRQ is autodetected 35499196d8acSJiri Slaby * If this fails an error is returned. 35509196d8acSJiri Slaby * 35519196d8acSJiri Slaby * On success the port is ready to use and the line number is returned. 35529196d8acSJiri Slaby */ 35539196d8acSJiri Slaby int serial8250_register_8250_port(struct uart_8250_port *up) 35549196d8acSJiri Slaby { 35559196d8acSJiri Slaby struct uart_8250_port *uart; 35569196d8acSJiri Slaby int ret = -ENOSPC; 35579196d8acSJiri Slaby 35589196d8acSJiri Slaby if (up->port.uartclk == 0) 35599196d8acSJiri Slaby return -EINVAL; 35609196d8acSJiri Slaby 35619196d8acSJiri Slaby mutex_lock(&serial_mutex); 35629196d8acSJiri Slaby 35639196d8acSJiri Slaby uart = serial8250_find_match_or_unused(&up->port); 35649196d8acSJiri Slaby if (uart && uart->port.type != PORT_8250_CIR) { 35659196d8acSJiri Slaby if (uart->port.dev) 35669196d8acSJiri Slaby uart_remove_one_port(&serial8250_reg, &uart->port); 35679196d8acSJiri Slaby 35689196d8acSJiri Slaby uart->port.iobase = up->port.iobase; 35699196d8acSJiri Slaby uart->port.membase = up->port.membase; 35709196d8acSJiri Slaby uart->port.irq = up->port.irq; 35719196d8acSJiri Slaby uart->port.irqflags = up->port.irqflags; 35729196d8acSJiri Slaby uart->port.uartclk = up->port.uartclk; 35739196d8acSJiri Slaby uart->port.fifosize = up->port.fifosize; 35749196d8acSJiri Slaby uart->port.regshift = up->port.regshift; 35759196d8acSJiri Slaby uart->port.iotype = up->port.iotype; 35769196d8acSJiri Slaby uart->port.flags = up->port.flags | UPF_BOOT_AUTOCONF; 35779196d8acSJiri Slaby uart->bugs = up->bugs; 35789196d8acSJiri Slaby uart->port.mapbase = up->port.mapbase; 35799196d8acSJiri Slaby uart->port.private_data = up->port.private_data; 35809196d8acSJiri Slaby uart->port.fifosize = up->port.fifosize; 35819196d8acSJiri Slaby uart->tx_loadsz = up->tx_loadsz; 35829196d8acSJiri Slaby uart->capabilities = up->capabilities; 3583e676253bSRicardo Ribalda Delgado uart->rs485_config = up->rs485_config; 3584e676253bSRicardo Ribalda Delgado uart->rs485 = up->rs485; 3585234abab1SSebastian Andrzej Siewior uart->port.throttle = up->port.throttle; 3586234abab1SSebastian Andrzej Siewior uart->port.unthrottle = up->port.unthrottle; 35879196d8acSJiri Slaby 3588ef99f3aeSGreg Kroah-Hartman /* Take tx_loadsz from fifosize if it wasn't set separately */ 3589ef99f3aeSGreg Kroah-Hartman if (uart->port.fifosize && !uart->tx_loadsz) 3590ef99f3aeSGreg Kroah-Hartman uart->tx_loadsz = uart->port.fifosize; 3591ef99f3aeSGreg Kroah-Hartman 35929196d8acSJiri Slaby if (up->port.dev) 35939196d8acSJiri Slaby uart->port.dev = up->port.dev; 35949196d8acSJiri Slaby 35959196d8acSJiri Slaby if (up->port.flags & UPF_FIXED_TYPE) 35969196d8acSJiri Slaby serial8250_init_fixed_type_port(uart, up->port.type); 35979196d8acSJiri Slaby 35989196d8acSJiri Slaby set_io_from_upio(&uart->port); 35999196d8acSJiri Slaby /* Possibly override default I/O functions. */ 36009196d8acSJiri Slaby if (up->port.serial_in) 36019196d8acSJiri Slaby uart->port.serial_in = up->port.serial_in; 36029196d8acSJiri Slaby if (up->port.serial_out) 36039196d8acSJiri Slaby uart->port.serial_out = up->port.serial_out; 36049196d8acSJiri Slaby if (up->port.handle_irq) 36059196d8acSJiri Slaby uart->port.handle_irq = up->port.handle_irq; 36069196d8acSJiri Slaby /* Possibly override set_termios call */ 36079196d8acSJiri Slaby if (up->port.set_termios) 36089196d8acSJiri Slaby uart->port.set_termios = up->port.set_termios; 3609b99b121bSSebastian Andrzej Siewior if (up->port.startup) 3610b99b121bSSebastian Andrzej Siewior uart->port.startup = up->port.startup; 3611b99b121bSSebastian Andrzej Siewior if (up->port.shutdown) 3612b99b121bSSebastian Andrzej Siewior uart->port.shutdown = up->port.shutdown; 36139196d8acSJiri Slaby if (up->port.pm) 36149196d8acSJiri Slaby uart->port.pm = up->port.pm; 36159196d8acSJiri Slaby if (up->port.handle_break) 36169196d8acSJiri Slaby uart->port.handle_break = up->port.handle_break; 36179196d8acSJiri Slaby if (up->dl_read) 36189196d8acSJiri Slaby uart->dl_read = up->dl_read; 36199196d8acSJiri Slaby if (up->dl_write) 36209196d8acSJiri Slaby uart->dl_write = up->dl_write; 36219196d8acSJiri Slaby if (up->dma) 36229196d8acSJiri Slaby uart->dma = up->dma; 36239196d8acSJiri Slaby 36249196d8acSJiri Slaby if (serial8250_isa_config != NULL) 36259196d8acSJiri Slaby serial8250_isa_config(0, &uart->port, 36269196d8acSJiri Slaby &uart->capabilities); 36279196d8acSJiri Slaby 36289196d8acSJiri Slaby ret = uart_add_one_port(&serial8250_reg, &uart->port); 36299196d8acSJiri Slaby if (ret == 0) 36309196d8acSJiri Slaby ret = uart->port.line; 36319196d8acSJiri Slaby } 36329196d8acSJiri Slaby mutex_unlock(&serial_mutex); 36339196d8acSJiri Slaby 36349196d8acSJiri Slaby return ret; 36359196d8acSJiri Slaby } 36369196d8acSJiri Slaby EXPORT_SYMBOL(serial8250_register_8250_port); 36379196d8acSJiri Slaby 36389196d8acSJiri Slaby /** 36399196d8acSJiri Slaby * serial8250_unregister_port - remove a 16x50 serial port at runtime 36409196d8acSJiri Slaby * @line: serial line number 36419196d8acSJiri Slaby * 36429196d8acSJiri Slaby * Remove one serial port. This may not be called from interrupt 36439196d8acSJiri Slaby * context. We hand the port back to the our control. 36449196d8acSJiri Slaby */ 36459196d8acSJiri Slaby void serial8250_unregister_port(int line) 36469196d8acSJiri Slaby { 36479196d8acSJiri Slaby struct uart_8250_port *uart = &serial8250_ports[line]; 36489196d8acSJiri Slaby 36499196d8acSJiri Slaby mutex_lock(&serial_mutex); 36509196d8acSJiri Slaby uart_remove_one_port(&serial8250_reg, &uart->port); 36519196d8acSJiri Slaby if (serial8250_isa_devs) { 36529196d8acSJiri Slaby uart->port.flags &= ~UPF_BOOT_AUTOCONF; 36539196d8acSJiri Slaby uart->port.type = PORT_UNKNOWN; 36549196d8acSJiri Slaby uart->port.dev = &serial8250_isa_devs->dev; 36559196d8acSJiri Slaby uart->capabilities = uart_config[uart->port.type].flags; 36569196d8acSJiri Slaby uart_add_one_port(&serial8250_reg, &uart->port); 36579196d8acSJiri Slaby } else { 36589196d8acSJiri Slaby uart->port.dev = NULL; 36599196d8acSJiri Slaby } 36609196d8acSJiri Slaby mutex_unlock(&serial_mutex); 36619196d8acSJiri Slaby } 36629196d8acSJiri Slaby EXPORT_SYMBOL(serial8250_unregister_port); 36639196d8acSJiri Slaby 36649196d8acSJiri Slaby static int __init serial8250_init(void) 36659196d8acSJiri Slaby { 36669196d8acSJiri Slaby int ret; 36679196d8acSJiri Slaby 36689196d8acSJiri Slaby serial8250_isa_init_ports(); 36699196d8acSJiri Slaby 36709196d8acSJiri Slaby printk(KERN_INFO "Serial: 8250/16550 driver, " 36719196d8acSJiri Slaby "%d ports, IRQ sharing %sabled\n", nr_uarts, 36729196d8acSJiri Slaby share_irqs ? "en" : "dis"); 36739196d8acSJiri Slaby 36749196d8acSJiri Slaby #ifdef CONFIG_SPARC 36759196d8acSJiri Slaby ret = sunserial_register_minors(&serial8250_reg, UART_NR); 36769196d8acSJiri Slaby #else 36779196d8acSJiri Slaby serial8250_reg.nr = UART_NR; 36789196d8acSJiri Slaby ret = uart_register_driver(&serial8250_reg); 36799196d8acSJiri Slaby #endif 36809196d8acSJiri Slaby if (ret) 36819196d8acSJiri Slaby goto out; 36829196d8acSJiri Slaby 36839196d8acSJiri Slaby ret = serial8250_pnp_init(); 36849196d8acSJiri Slaby if (ret) 36859196d8acSJiri Slaby goto unreg_uart_drv; 36869196d8acSJiri Slaby 36879196d8acSJiri Slaby serial8250_isa_devs = platform_device_alloc("serial8250", 36889196d8acSJiri Slaby PLAT8250_DEV_LEGACY); 36899196d8acSJiri Slaby if (!serial8250_isa_devs) { 36909196d8acSJiri Slaby ret = -ENOMEM; 36919196d8acSJiri Slaby goto unreg_pnp; 36929196d8acSJiri Slaby } 36939196d8acSJiri Slaby 36949196d8acSJiri Slaby ret = platform_device_add(serial8250_isa_devs); 36959196d8acSJiri Slaby if (ret) 36969196d8acSJiri Slaby goto put_dev; 36979196d8acSJiri Slaby 36989196d8acSJiri Slaby serial8250_register_ports(&serial8250_reg, &serial8250_isa_devs->dev); 36999196d8acSJiri Slaby 37009196d8acSJiri Slaby ret = platform_driver_register(&serial8250_isa_driver); 37019196d8acSJiri Slaby if (ret == 0) 37029196d8acSJiri Slaby goto out; 37039196d8acSJiri Slaby 37049196d8acSJiri Slaby platform_device_del(serial8250_isa_devs); 37059196d8acSJiri Slaby put_dev: 37069196d8acSJiri Slaby platform_device_put(serial8250_isa_devs); 37079196d8acSJiri Slaby unreg_pnp: 37089196d8acSJiri Slaby serial8250_pnp_exit(); 37099196d8acSJiri Slaby unreg_uart_drv: 37109196d8acSJiri Slaby #ifdef CONFIG_SPARC 37119196d8acSJiri Slaby sunserial_unregister_minors(&serial8250_reg, UART_NR); 37129196d8acSJiri Slaby #else 37139196d8acSJiri Slaby uart_unregister_driver(&serial8250_reg); 37149196d8acSJiri Slaby #endif 37159196d8acSJiri Slaby out: 37169196d8acSJiri Slaby return ret; 37179196d8acSJiri Slaby } 37189196d8acSJiri Slaby 37199196d8acSJiri Slaby static void __exit serial8250_exit(void) 37209196d8acSJiri Slaby { 37219196d8acSJiri Slaby struct platform_device *isa_dev = serial8250_isa_devs; 37229196d8acSJiri Slaby 37239196d8acSJiri Slaby /* 37249196d8acSJiri Slaby * This tells serial8250_unregister_port() not to re-register 37259196d8acSJiri Slaby * the ports (thereby making serial8250_isa_driver permanently 37269196d8acSJiri Slaby * in use.) 37279196d8acSJiri Slaby */ 37289196d8acSJiri Slaby serial8250_isa_devs = NULL; 37299196d8acSJiri Slaby 37309196d8acSJiri Slaby platform_driver_unregister(&serial8250_isa_driver); 37319196d8acSJiri Slaby platform_device_unregister(isa_dev); 37329196d8acSJiri Slaby 37339196d8acSJiri Slaby serial8250_pnp_exit(); 37349196d8acSJiri Slaby 37359196d8acSJiri Slaby #ifdef CONFIG_SPARC 37369196d8acSJiri Slaby sunserial_unregister_minors(&serial8250_reg, UART_NR); 37379196d8acSJiri Slaby #else 37389196d8acSJiri Slaby uart_unregister_driver(&serial8250_reg); 37399196d8acSJiri Slaby #endif 37409196d8acSJiri Slaby } 37419196d8acSJiri Slaby 37429196d8acSJiri Slaby module_init(serial8250_init); 37439196d8acSJiri Slaby module_exit(serial8250_exit); 37449196d8acSJiri Slaby 37459196d8acSJiri Slaby EXPORT_SYMBOL(serial8250_suspend_port); 37469196d8acSJiri Slaby EXPORT_SYMBOL(serial8250_resume_port); 37479196d8acSJiri Slaby 37489196d8acSJiri Slaby MODULE_LICENSE("GPL"); 37499196d8acSJiri Slaby MODULE_DESCRIPTION("Generic 8250/16x50 serial driver"); 37509196d8acSJiri Slaby 37519196d8acSJiri Slaby module_param(share_irqs, uint, 0644); 37529196d8acSJiri Slaby MODULE_PARM_DESC(share_irqs, "Share IRQs with other non-8250/16x50 devices" 37539196d8acSJiri Slaby " (unsafe)"); 37549196d8acSJiri Slaby 37559196d8acSJiri Slaby module_param(nr_uarts, uint, 0644); 37569196d8acSJiri Slaby MODULE_PARM_DESC(nr_uarts, "Maximum number of UARTs supported. (1-" __MODULE_STRING(CONFIG_SERIAL_8250_NR_UARTS) ")"); 37579196d8acSJiri Slaby 37589196d8acSJiri Slaby module_param(skip_txen_test, uint, 0644); 37599196d8acSJiri Slaby MODULE_PARM_DESC(skip_txen_test, "Skip checking for the TXEN bug at init time"); 37609196d8acSJiri Slaby 37619196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_RSA 37629196d8acSJiri Slaby module_param_array(probe_rsa, ulong, &probe_rsa_count, 0444); 37639196d8acSJiri Slaby MODULE_PARM_DESC(probe_rsa, "Probe I/O ports for RSA"); 37649196d8acSJiri Slaby #endif 37659196d8acSJiri Slaby MODULE_ALIAS_CHARDEV_MAJOR(TTY_MAJOR); 37669196d8acSJiri Slaby 37679326b047SJiri Slaby #ifdef CONFIG_SERIAL_8250_DEPRECATED_OPTIONS 37689196d8acSJiri Slaby #ifndef MODULE 37699196d8acSJiri Slaby /* This module was renamed to 8250_core in 3.7. Keep the old "8250" name 37709196d8acSJiri Slaby * working as well for the module options so we don't break people. We 37719196d8acSJiri Slaby * need to keep the names identical and the convenient macros will happily 37729196d8acSJiri Slaby * refuse to let us do that by failing the build with redefinition errors 37739196d8acSJiri Slaby * of global variables. So we stick them inside a dummy function to avoid 37749196d8acSJiri Slaby * those conflicts. The options still get parsed, and the redefined 37759196d8acSJiri Slaby * MODULE_PARAM_PREFIX lets us keep the "8250." syntax alive. 37769196d8acSJiri Slaby * 37779196d8acSJiri Slaby * This is hacky. I'm sorry. 37789196d8acSJiri Slaby */ 37799196d8acSJiri Slaby static void __used s8250_options(void) 37809196d8acSJiri Slaby { 37819196d8acSJiri Slaby #undef MODULE_PARAM_PREFIX 37829196d8acSJiri Slaby #define MODULE_PARAM_PREFIX "8250_core." 37839196d8acSJiri Slaby 37849196d8acSJiri Slaby module_param_cb(share_irqs, ¶m_ops_uint, &share_irqs, 0644); 37859196d8acSJiri Slaby module_param_cb(nr_uarts, ¶m_ops_uint, &nr_uarts, 0644); 37869196d8acSJiri Slaby module_param_cb(skip_txen_test, ¶m_ops_uint, &skip_txen_test, 0644); 37879196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_RSA 37889196d8acSJiri Slaby __module_param_call(MODULE_PARAM_PREFIX, probe_rsa, 37899196d8acSJiri Slaby ¶m_array_ops, .arr = &__param_arr_probe_rsa, 37909196d8acSJiri Slaby 0444, -1); 37919196d8acSJiri Slaby #endif 37929196d8acSJiri Slaby } 37939196d8acSJiri Slaby #else 37949196d8acSJiri Slaby MODULE_ALIAS("8250_core"); 37959196d8acSJiri Slaby #endif 37969326b047SJiri Slaby #endif 3797